Surreptitious.....

[oldeskewltoy]

Hmmmmmm, been doing some research for XNC since his rear diff is whining, and he was looking for a replacement. My car, AE71 coupe, had 2 rear diff ratio options(per toyodiy) - 3.72, and a 3.58. I ASSUMED that she has the 3.72... but I ASSUMED WRONG.



http://www.celica-gts.com/resources/diff...codes.html


The final drive gear in my car is listed as a S374(bottom row in photo above). Go to the above link, and the S374 breaksdown to a 6.38" 4 pinion diff, but NOT a 3.72 final drive, but a 3.58 final drive :eek: :eek:

I then remember the 1983 EPA standards for the AE71 coupe was 35mpg highway, I never understood why??? http://www.afdc.energy.gov/afdc/pdfs/1983_feg.pdf
AND.... 5th gear has truly been an O/D for me, where the only time I ever need to use it is on the highway

It now makes perfect sense why... I'm running around with a 3.58 final drive :eek::eek:

This keeps getting more and more odd... Originally I thought it had a 3.9, then I thought it to be a 3.7, now I find out it really is a 3.58... and I wonder just how fast a 1/4 she could run(15.77 as she currently sits w the 3.5 *IF* the gearing in her was more acceleration oriented... like a 3.9, 4.1, or 4.30

We shall see... The LEEN adapter is on its way, and I hope to get a 3.9 "T"(6.7") gear set before too long. I'll try to get this all assembled and ready for spring 2012 drag race season and do a few more runs to see how well she can do with gearing better matched to the engines character

oldeskewltoy Wrote:The LEEN adapter is on its way

And I best prepare......

I decided NOT to purchased the LEEN shifter relocation parts, for I do not plan on moving the J160 shifter

The shifter hole in the AE86 and the AE71 use a T50 shifter, which uses a shifter that is bent toward the rear



meanwhile the J160 shifter is far more vertical



To allow for this discrepancy, I've decided to use the J160 shifter in the closer(more forward) of its 2 positions, this moves the shifter back 5" from where the stock T50 would poke through the floor

This will place the J160 shifter(the part the driver grabs) in a slightly more rearward position compared to where the T50 shifter is now... maybe an 1" to 2" more rearward, but that is far better for my chosen driving style.

For those who like visual help... The center of the T50 shifter in the view below is @ 13", the placement would be 5" back or right @ the gap between the raised section for the shifter and the laterial/leading edge of seat mounting reinforcement



In the photo above, with the handbrake up, it is tough to see, so try to use your imagination to visualize the handbrake arc.... but the lowered handbrake will get very close to the shifter if the shifter is 5" toward the rear.

So, to better fit the new shifter location, I decided to shorten the handbrake. XNC was @ a local junkyard and he picked up a E7 handbrake assembly for me... thank you Johnny. I then proceeded to shorten the assembly by almost 2"



I'll finish this by drilling the rivet center and use a screw to secure the rivet.