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Old 03-28-2012, 12:57 PM   #1
-rpark-
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Default Gear change ?

I'm getting ready to bite the bullet on a gear change kit. I've noticed that AM has the kit offered with 3 qts of RP oil and LMR offers the kit with 2 qts of RP oil and 1 bottle of FR friction modifier.

From what I'm understanding the friction modifier is only needed with traction-lock rear ends.

Mine is a 2012 GT manual with 3.31 gears. I am unsure if it is a traction-lock unit and if I need to use the friction modifier?

Also some of these kits come with the old style inner pinion bearing which they say will work in the new style.

Is it worth it to spend an extra $50 on the new style bearing?

Thanks
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Old 03-28-2012, 01:07 PM   #2
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i'm not sure about the bearing.

but you do have a LSD rear end, so it needs the friction mod.
even with the RP, i would still add the friction mod.
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Old 03-28-2012, 01:21 PM   #3
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i went with lmr and got FRPP 4.10 gears, FRPP install kit, 3 bottles of RP and friction modifier.
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Old 03-28-2012, 01:24 PM   #4
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Quote:
Originally Posted by lawrencecar1 View Post
i went with lmr and got FRPP 4.10 gears, FRPP install kit, 3 bottles of RP and friction modifier.
hmmm...now the kit only comes with 2 botles of RP

http://www.latemodelrestoration.com/...r-End-Gear-Kit

how much does the rear end hold?
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Old 03-28-2012, 01:39 PM   #5
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actually i got the RP from summit. LMR doesnt carry the right weight. Also the kit you reference doesn't have the frpp install kit. I paid a little more and got the frpp one.


M19546A
FORD RACING FRICTION MODIFIER, M-19546-A
1 0 1 7.99 7.99
M420988410
1986-12 MUSTANG 4.10 GEARS FOR 8.8" REAR, FORD RACING M-4209-88410
1 0 1 139.99 139.99
M4210B2
1986-12 MUSTANG RING & PINION INSTALL KIT, M-4210-B2
1 0 1 99.99 99.99

Last edited by lawrencecar1; 03-28-2012 at 01:41 PM.
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Old 03-28-2012, 02:06 PM   #6
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Quote:
Originally Posted by lawrencecar1 View Post
actually i got the RP from summit. LMR doesnt carry the right weight. Also the kit you reference doesn't have the frpp install kit. I paid a little more and got the frpp one.


M19546A
FORD RACING FRICTION MODIFIER, M-19546-A
1 0 1 7.99 7.99
M420988410
1986-12 MUSTANG 4.10 GEARS FOR 8.8" REAR, FORD RACING M-4209-88410
1 0 1 139.99 139.99
M4210B2
1986-12 MUSTANG RING & PINION INSTALL KIT, M-4210-B2
1 0 1 99.99 99.99
thats good to know!

im having a hell of a time trying to find those parts on summits page you listed. the part number search didnt bring them up for me...and a ford racing search under mustangs didnt include them either?
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Old 03-28-2012, 03:38 PM   #7
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Are you going with 4.10s on a 2012 GT? You may want to go test drive one with 3.73s before you make your purchase. First gear is lower on the 6-speed 2011+ GTs, so I have heard that 3.73s feel like 4.10s on a 05-10 with the 5-speed.

I test drove a 5.0 GT with 3.73s and it felt like it had too much gear (too low). I decided that 3.55s would be better for my driving style. A search will produce a few threads about the gearing difference between the 5-speed and the new 6-speed transmissions...
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Old 03-28-2012, 03:41 PM   #8
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Quote:
Originally Posted by jdmcbride View Post
Are you going with 4.10s on a 2012 GT? You may want to go test drive one with 3.73s before you make your purchase. First gear is lower on the 6-speed 2011+ GTs, so I have heard that 3.73s feel like 4.10s on a 05-10 with the 5-speed.

I test drove a 5.0 GT with 3.73s and it felt like it had too much gear (too low). I decided that 3.55s would be better for my driving style. A search will produce a few threads about the gearing difference between the 5-speed and the new 6-speed transmissions...
im planning 3.73. 3.55's are to close to 3.31....plus the boss runs 3.73's
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Old 04-01-2012, 02:39 PM   #9
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change of plans...went with the 4.10's instead and here is why:




i found the kit the poster listed above on ebay from blue oval for about 233.00 total...all ford racing parts.

i have to buy the oil though. i think im going to go with amsoil since thats what im running in my engine and tranny instead of the royal purple.

im still undecided on which weight to use...the factory spec 75w140, or run a little lighter 75w90?
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Old 04-01-2012, 03:46 PM   #10
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I just installed a new differential cover yesterday. I used two bottles of oil and one 4 oz bottle of FM. I started to pump in the third bottle and the fluid started to drip out the hole. Poured all the used oil back into the empty bottles. It was the same amount.
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