T90 To T18 Swap

Yeah, and it looks perfect
But at this point I'm replacing everything between the flywheel and the driveshaft so it doesn't really matter.

 

Don't forget to upgrade the stay cable.

 

Had a clutch in a chevy truck not shifting right. Clutch was good but clutch fork was wore.

 

Doesn't have one

 

It's a 70 with cable clutch, and it works as it should.

 

Should have changed the title to "Trouble 90 to Terrific T18 swap"

 

Hey Doug we're with you every step of way.

 

I have parts ordered from all over the place...new input shaft arrived yesterday.


Waiting on a pilot bushing & a gasket set for the OD coming from AA, transmission gasket kit from PartsMike, clutch parts from Rock Auto, a couple gallons of GL3 90wt coming from Amazon, a new clutch cable from Inline Tube, and a driveshaft yoke from R&P in Oregon.

 

Th

The cash register is ringing

 

Still need a gasket set for the tcase, and I'll have to pay to get the lengths changed on my driveshafts.
Probably a few other little things I've forgotten, but hopefully no more major $$$.

 

front yoke might make up most of the difference.

T-90 8" case with 2.625" adapter... 10.625"
T-18 11.875" case with 1" adapter... 12.875

A little grinding wheel on the rear splines might be all you need.

 

You'll need a front yoke for the transfercase and a whole new driveshaft for the front to go with the bigger U-joints.

 

I have those.

 

I would strongly consider upgrading to a CV drive shaft at this time. You will need to install a CV yoke on the rear output of the transfer case.

 

Which brand of gear oil did you order from amazon?

 

Sta Lube

 

It doesn't really seem necessary with a D18, a T18 that's only 1.5" longer than the stock transmission, and a 2.5" lift.

Not much u-joint angle on my '71 with this setup. The lower rear output of the D18 vs a D20 really helps:

 

Can you post some detail pictures of your crossmember and trans mount, and also your clutch cable (if you're still using one)?

 

Make sure the driveshaft/transmission/transfer case centerline is PARALLEL with the pinion yoke in the rear differential.
This should have been marked somehow prior to disassembling the drivetrain.

 

Yes this is important. Since i didn't have any driveline vibration prior to the swap, I matched the angle of the drivetrain before and after.

Before with the T-14:


After with the T-18. I got within 0.2 degrees: