I attempted to install a KTRE 12 bolt rear in my car today. As you can see in the picture, it has thrown my wheel base wayyyyy out of whack. Currently the car has a fully adjustable spohn suspension. control arms, LCA brackets, torque arms, and pan hard rod. i had to lengthen both the control arms to get them to bolt up. the stock rear fit the car fine so im thinking the 12 bolts pinion sticks out further. If this is the case what effect would moving my torque arm mount (also spohn with a th400 trans) forward do? has anyone else had this problem? Im lost right now..

 

i need someone to show me how to upload photos. i keep getting "upload failed"

 

Upload them to a site like photo bucket and link to them.

If I was not about to go to bed I would let you email them to me and I could upload them for you.

 

 

That would explain why the wheelbase is now too long.

THINK:

The ring gear in the 12-bolt is over an inch larger than the ring gear in the 10-bolt. All else equal, the pinion gear would be moved to the front accordingly. But of course, all else is NOT equal; in reality, the pinion gear is LONGER than the 10-bolt one, as well, thereby moving the yoke EVEN FARTHER forward.

Put the CAs back where they belong. Shorten the drive shaft.

Torque arm might need to be shortened as well; might want to give Steve a call. He's probably seen this before.

 

you called it right. the drive shaft is too long. made a call to spohn today. they said the drive shaft would be made in 5-10 days.

this is with the drive shaft all the way into the trans. and the weight of the car on the axle.

 

Makes sense...

See my signature for a tip about logic. I tend to think in that way because I'm pretty simple to begin with, and can't handle complicated stuff, and around cars (which are about as simple as it gets) that mental approach seems to work pretty well for the most part.

 

WOW, when I put the 440 into my 72 Charger I used a local company to make my drive shaft.

It was way cheaper then I thought it would be.

You don't have someone close by to do the work?

 

I dont know of any good driveshaft shops in my area. We have alot of parts stores but only 2 good ones. My area consists alot more of corporate owned companies that hire people that know how to look things up in computer, not people that are knowledgeable or skilled with tasks. Also Ive dealt with Spohn several times, and have nothing but good things to say about them. Their service and parts have been nothing but top notch. Could I have found somewhere cheaper? Probably. Id rather spend alittle extra to support the shops that help support us. Plus their a site sponsor so thats good too.