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8.8 Rear End Build

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Old 06-29-2013, 11:38 AM   #1
Duncan_GT
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Default 8.8 Rear End Build

With the motor coming to a close in the next month, I need to start looking at beefing up my driveline. I've already decided on a upgraded TKO 600 from Astro and a Ford Racing aluminum driveshaft. Besides the rear gears, I haven't the slightest idea what to do with the rear end.

What are some suggestions? I know very little about rear ends, other than my chances of breaking it are pretty good. I'd like to try and stay away from a spool, as their street use and cornering isn't great. What about C clip eliminators? Axles - I'm thinking 33 spline Moser or Strange. I've read 35 splines have issues in the 8.8's.

I'm not racing the car until next year, so that gives me the winter to piece together the rest of the drivetrain. I'll be doing test & tune at the track in the fall and get the motor right, then its back to the garage. Thanks guys in advance, I appreciate the input.
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1995 Mustang GT
1999 F150 Lariat 4x4

Soon to come: 393 stroker
351w bored .030, Probe Industries forged internals, Trickflow 205's, FTI custom cam, Trickflow R 90mm intake, Accufab 90mm TB, FRPP 42lb injectors, 1 3/4" custom Accufab LT's, 3" exhaust, MS2
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Old 06-29-2013, 12:28 PM   #2
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with the power you plan to put out, 4.10-4.30 gears, 31 or better yet 33 spline, c-clip eliminators, rear end girdle cover, as for the Posi unit to use, Detroit true-trac are an awesome set up
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Old 06-29-2013, 12:53 PM   #3
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Originally Posted by mjr46 View Post
with the power you plan to put out, 4.10-4.30 gears, 31 or better yet 33 spline, c-clip eliminators, rear end girdle cover, as for the Posi unit to use, Detroit true-trac are an awesome set up
Yep, Ed spec'd my cam for 4.10's. I'm definitely leaning towards 33 spline axles. What's this I keep reading about upgrading to 9" ends instead of the c-clip eliminators, what are they talking about? I looked up the Detroit truetrac, its only available with a 31 spline
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1995 Mustang GT
1999 F150 Lariat 4x4

Soon to come: 393 stroker
351w bored .030, Probe Industries forged internals, Trickflow 205's, FTI custom cam, Trickflow R 90mm intake, Accufab 90mm TB, FRPP 42lb injectors, 1 3/4" custom Accufab LT's, 3" exhaust, MS2

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Old 06-29-2013, 05:59 PM   #4
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I'm shopping around for my up-grade. Will drag with street 285'ish no F/I modded N/A
Torsen T2 is on Boss because it's good for stop/go track, The Yukon is good for drag.
Detroit? I feel if I bomb proof the driveline may avoid the sled truck ride home.
Spec. Stage1 clutch with steel braided lines and aluminum flywheel, ShaftMaster aluminum Yukon posi with 3.73 FR aluminum Diff cover, Alloy diff shafts, LCB on my LCA's and a Swarr-bar. BMR Safety loops also act as stiffeners for the driveshaft trench flexing away under your Stang belly.

This is cheaper then fixing it after separating from the axil.

Later

P.S. Still open to Clutch suggestions, Spec seems to be the entry/DD still can parallel park but has 595 ft lbs.

Last edited by VistaBlueFrank68; 06-29-2013 at 06:03 PM. Reason: What clutch is best for DD weekend drag?
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Old 06-29-2013, 06:36 PM   #5
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Grammar goes a long way.
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1995 Mustang GT
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Soon to come: 393 stroker
351w bored .030, Probe Industries forged internals, Trickflow 205's, FTI custom cam, Trickflow R 90mm intake, Accufab 90mm TB, FRPP 42lb injectors, 1 3/4" custom Accufab LT's, 3" exhaust, MS2
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Old 06-29-2013, 07:02 PM   #6
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Thanks Duncan

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Old 06-30-2013, 12:06 AM   #7
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Moser can supply your 33 spline axles as well as a 'C' clip eliminator kit for a standarn diameter axle I'm sure.
Ok, follow this. All auto axle spline counts are based on 1" diameter, the more spline the greater the strength.
33 spline axles are a great idea but do any of the heavy duty 'posi' type units come with 33 splines?
Even better, imo, would be 35 spline.
Mosers catalog explains all this much better......
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Old 06-30-2013, 08:44 AM   #8
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Quote:
Originally Posted by tinman View Post
Moser can supply your 33 spline axles as well as a 'C' clip eliminator kit for a standarn diameter axle I'm sure.
Ok, follow this. All auto axle spline counts are based on 1" diameter, the more spline the greater the strength.
33 spline axles are a great idea but do any of the heavy duty 'posi' type units come with 33 splines?
Even better, imo, would be 35 spline.
Mosers catalog explains all this much better......
Yeah i was looking for a posi unit that used 33 spline, most of them use 31
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1995 Mustang GT
1999 F150 Lariat 4x4

Soon to come: 393 stroker
351w bored .030, Probe Industries forged internals, Trickflow 205's, FTI custom cam, Trickflow R 90mm intake, Accufab 90mm TB, FRPP 42lb injectors, 1 3/4" custom Accufab LT's, 3" exhaust, MS2
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Old 06-30-2013, 09:55 AM   #9
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Quote:
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...All auto axle spline counts are based on 1" diameter, the more spline the greater the strength.......
Spline pitch is based on 1" diameter, not spline count.
A splined shaft with the same pitch tooth but larger count will need to be bigger in diameter (i.e. stronger)
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Old 06-30-2013, 10:16 AM   #10
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Will i need to upgrade the axle housings if I upgrade to bigger axles?
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1995 Mustang GT
1999 F150 Lariat 4x4

Soon to come: 393 stroker
351w bored .030, Probe Industries forged internals, Trickflow 205's, FTI custom cam, Trickflow R 90mm intake, Accufab 90mm TB, FRPP 42lb injectors, 1 3/4" custom Accufab LT's, 3" exhaust, MS2
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Old 06-30-2013, 12:09 PM   #11
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Quote:
Originally Posted by Duncan_GT View Post
Grammar goes a long way.
lol, Engrish please............
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Old 06-30-2013, 01:17 PM   #12
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Quote:
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lol, Engrish please............
*Engrish prease
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1995 Mustang GT
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351w bored .030, Probe Industries forged internals, Trickflow 205's, FTI custom cam, Trickflow R 90mm intake, Accufab 90mm TB, FRPP 42lb injectors, 1 3/4" custom Accufab LT's, 3" exhaust, MS2
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Old 06-30-2013, 01:25 PM   #13
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I went with 35 spline and a spool. The spool isn't real friendly around the curves but should be strong as hell in a str8 line.
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ENGINE363 forged dart engine. 300 shot!TRANNY C4 with trans brake, 3800 stall, 9in. raceconverter, hurst shifter REAR Moser 35 spline kit with spool, FRPP 3.73 gearsSUSPENION UPR Upper & lower control arms, Strange 10 way dampers, coilovers up front, BBK sub frame connectors, UPR Tube K-member & A-arms NEW Mustang TIMES COMING.
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Old 06-30-2013, 02:07 PM   #14
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I went with 35 spline and a spool. The spool isn't real friendly around the curves but should be strong as hell in a str8 line.
Did you upgrade your whole rear end? What's the general rule of thumb as far as rear end torque limits when looking at different splines? I've seen the 31 spline Cobra rear ends are a good upgrade, but I want to upgrade it to just about bullet proof level and forget about it. What's a 33 spline axle good for, torque-wise?
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1995 Mustang GT
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Soon to come: 393 stroker
351w bored .030, Probe Industries forged internals, Trickflow 205's, FTI custom cam, Trickflow R 90mm intake, Accufab 90mm TB, FRPP 42lb injectors, 1 3/4" custom Accufab LT's, 3" exhaust, MS2
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Old 06-30-2013, 02:35 PM   #15
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8.8 is plenty strong for what you want to do, heck, with a rear girdle, 28 spline heavy duty axles and at that 4 lug still, I have run 10's and not had an issue, that's not to say I won't ever..lol
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Old 06-30-2013, 03:51 PM   #16
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Quote:
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Did you upgrade your whole rear end? What's the general rule of thumb as far as rear end torque limits when looking at different splines? I've seen the 31 spline Cobra rear ends are a good upgrade, but I want to upgrade it to just about bullet proof level and forget about it. What's a 33 spline axle good for, torque-wise?
I basically did up grade the entire rear with the spool & 35 spline axles with C-clip eliminators. I put the rear end girdle on. Had the tubes welded and she's as strong as you'll probably get with an 8.8. I way overbuilt my car because the goal is 9s eventually. I have no idea what the torque rating would be on a 33 spline axles. It's all dependant on how your using them. Street tires that will brake loose will probably out live slicks dead hooking at the track. I've included a photo below of the size difference between stock 28s and 31s. So you can just imagine how much stronger the 33s will be.

Click the image to open in full size.
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ENGINE363 forged dart engine. 300 shot!TRANNY C4 with trans brake, 3800 stall, 9in. raceconverter, hurst shifter REAR Moser 35 spline kit with spool, FRPP 3.73 gearsSUSPENION UPR Upper & lower control arms, Strange 10 way dampers, coilovers up front, BBK sub frame connectors, UPR Tube K-member & A-arms NEW Mustang TIMES COMING.
2011 Camaro SS 12.34@110.92

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Old 06-30-2013, 04:03 PM   #17
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Damn thats beefy. I dont see any company that makes a diff for 33 spline that isnt a spool. I'd like to stay away from it since I like taking corners
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Soon to come: 393 stroker
351w bored .030, Probe Industries forged internals, Trickflow 205's, FTI custom cam, Trickflow R 90mm intake, Accufab 90mm TB, FRPP 42lb injectors, 1 3/4" custom Accufab LT's, 3" exhaust, MS2
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Old 06-30-2013, 04:16 PM   #18
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Ive been looking at the Detroit Truetrac that mjr recommended and read about the Auburn units, how are those? Any reviews or word of mouth?
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Soon to come: 393 stroker
351w bored .030, Probe Industries forged internals, Trickflow 205's, FTI custom cam, Trickflow R 90mm intake, Accufab 90mm TB, FRPP 42lb injectors, 1 3/4" custom Accufab LT's, 3" exhaust, MS2
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Old 06-30-2013, 09:02 PM   #19
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Yep, my bad on the spline pitch deal.
Duncan: I use a standard 8.8" housing with my 33 spline Moser axles and spool.
If your car is going to run 10.99 or quicker NHRA/IHRA is going to make you use an 'SFI' approved axle anyway.,....
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Old 06-30-2013, 09:11 PM   #20
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Quote:
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Yep, my bad on the spline pitch deal.
Duncan: I use a standard 8.8" housing with my 33 spline Moser axles and spool.
If your car is going to run 10.99 or quicker NHRA/IHRA is going to make you use an 'SFI' approved axle anyway.,....
Ok cool. I hope it'll run faster than 10.99 lol

So next in line is to figure out which units use a 33 spline axle
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Old 06-30-2013, 09:11 PM
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