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05-15-2009, 11:05 PM

#21

JMD

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Join Date: Jan 2007

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Quote:

Originally Posted by Gun Jam

Do you guys think that running the larger gears and bigger v8 components would actually be smart with the i6 setup? I know he now has the choice of more gear selections but with the increase drag from the larger components will he come out ahead?

I have never heard of this being done before..is there a good reason why?

-Gun

We ran a Ford 9" with 4.10 gears behind the 6 before we changed out the engine, it was a BLAST to drive and the heavier components did not seem to slow it down a bit. I think it come down to "better is better" in this case.

I will change my prior answer and defer to Kalli's expertise on the u-joint sizing.

We used the I-6 driveshaft behind the 408W, but I had the ends changed to 1350 on the rear for the 9" rear, and then the front to a 1310 style for the Tremec TKO.

It would make more sense and be cheaper to just buy a new shaft if changing both joints at the same time.

05-16-2009, 12:21 PM

#22

1slow67

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Got the front drivers side done. Working on passenger side now. Then rear end. I am going to make a writeup for those who have a 67-68 I6 and want to go 5 lug.

05-16-2009, 02:50 PM

#23

1slow67

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Front is done. Going to start on the rear today or tomorrow, not really sure.

05-16-2009, 04:25 PM

#24

1slow67

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http://mustangsunlimited.com/itemdy0...atKey=EMUSTANG

Is this the one I need. My driveshaft was to small and these are too. So what u-joint do I need for the driveshaft to make it fit the 8"?

Last edited by 1slow67; 05-16-2009 at 05:05 PM.

05-16-2009, 10:56 PM

#25

JMD

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You might be able to buy a "hybrid" U-joint at a driveline shop.

It is big on one end and small on the other...

If you can figure out what series yokes you have it MIGHT be a simple matter of getting a conversion joint.

The BEST fix is to have the shaft modified to have the right yoke, should cost about a Franklin...

Kalli probably has it right 1210 shaft, 1310 rear...

I did a quick internet search for "conversion u-joints", I did not find any 1210/1310 hybrids.

05-17-2009, 09:26 AM

#26

1slow67

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Kalli said there were no 1210/1310 u-joints. My grandfather has 2 V8 driveshafts he is only going to use 1, so I will try and get one from him.

05-17-2009, 09:52 AM

#27

kalli

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even if there was, this would be something you wouldn't want as the difference between the 2 axis is nearly and inch. There has been claims that tehre are conversion u-joints from 1210 to 1310, but noone ever came up with one when asked.

Depending if the driveshaft is a 1250, and the yoke 1310 you will find a hybrid in a syhop that'll fit you.

If you pass measurements as above (cup dias and length) of driveshaft and yoke I can tell you what you'll need.

edit: those u-bolts you posted should fit a stock V8 rear yoke. even if cap is 1-1/16 it'll do

Last edited by kalli; 05-17-2009 at 10:06 AM.