Auto rear end on a 5 speed trans swap... do i need to worry?

[shenronzero]

hey all,

In the next week or two im getting ready to sawp out my auto trans to a manual. I have everything i need except the rear end. am i going to be on with the auto one for a while till i get teh proper rear end?

thanks

 

[ms07s]

The rear end should be the same only difference in those is LSD or open and gear ratio.

 

[shenronzero]

The rear end should be the same only difference in those is LSD or open and gear ratio.

Is there goign to be a difference in the RMPs to MPH... I believe i havev seen one before that the MPH were off a by like 10MPHs

 

[theKnifeArtist]

I didn't seem to have a problem

 

[jdub]

The auto & manual LSD are the same for given years for turbo cars...earlier pre '89 cars had 3.91 ratios, '89 plus had 3.70 ratios. If you use the LSD that came with your car, your speedo should be accurate.

 

[spinningheadboy]

My swapped '91 runs at higher RPM at highway speeds, and I've lost 2 miles per gallon on the freeway. I do notice a differance....slight.

 

[Poodles]

He's changing the tranny, so he may have issue with the tranny speedo gear if it's off a different year...

 

[jdub]

^^^ Tis true...the years need to match. Or, get the correct gear and change it out.

 

[shenronzero]

He's changing the tranny, so he may have issue with the tranny speedo gear if it's off a different year...

ive not yey looked to see if they are the same but is that peice goign to be interchangeable from the auto to the manual... i know its n ez enough thing to change

 

[92TealSupra]

Isn't the cable itself different I don't mean the ratio or whatever, but the cable I thought was 110% different as well.

 

[D7MSupra]

i have a manual swapped car 89+ ,but i didnt do the swap so i dunno the diff. i believe the top end speed could be diff but thats odd bc these other guys just said that they both have 3.70. ill have to see when i get my other supra going.

 

[Nick M]

My swapped '91 runs at higher RPM at highway speeds, and I've lost 2 miles per gallon on the freeway. I do notice a differance....slight.

From installing a unit that was shorter.