using the T4 with 4.03 2.37 1.50 1.00 w/2.75 gears

______1500rpm_____ 2000rpm ______2500rpm

1st _____11_________15___________19
2nd______19________ 26 ________ 32
3rd_______30 _______ 40 ________ 51
4th______45 _________61 ________ 76



using the SROD with 3.07, 1.72, 1.00, 0.70 w/3.75 gears



_____1500rpm______2000rpm______2500rpm

1st___11________ 14 ________ 18
2nd___19________ 26 ________ 32
3rd ___33 ________ 44 ________ 56
4th ___48 ________ 63 ________ 79




Here is the calculator I used.
Gear Ratio Calculator

Almost looks like a wash, Either would work, the overlap, how does that look?



Here's the factory 3speed with 2.78, 1.62, 1.00, w/4.25 gears



_____1500rpm______2000rpm______2500rpm

1st___11________ 14 ________ 18
2nd___18________ 24 ________ 30
3rd ___29 ________ 39 ________ 49



Here's the factory 3speed with 2.78, 1.62, 1.00, w/3.75 gears



_____1500rpm______2000rpm______2500rpm

1st___12________ 16 ________ 20
2nd___21________ 27 ________ 34
3rd ___33 _________ 44 ________ 56


Here's the factory 3speed with 2.78, 1.62, 1.00, w/3.50 gears



_____1500rpm______2000rpm______2500rpm

1st___13________ 17 ________ 21
2nd___22________ 29 ________ 37
3rd ___36 _________ 48 ________ 60


Here's the factory 3speed with 2.78, 1.62, 1.00, w/3.25 gears



_____1500rpm______2000rpm______2500rpm

1st___14________ 18 ________ 23
2nd___24________ 32 ________ 40
3rd ___38 _________ 51 ________ 64

 

Well it looks like the results are the same so lets back track...How difficult would each mounting be? Mounting capability...modifications needed for each (shifting/crossmember).....parts availability (bell housings if needed, starter mounting room) etc!

 

Agreed, from my searching, it looks like it's the T5 install vs a top loader install. I think I'll play it by ear for now and see what becomes available first. Price wise new they appear to be the same. wilcap vs speedway


rumor has it the cases of the T4 and T5 are the same.

 

I had and drove a stone stock 34 tudor about 20,000 miles with a stock 85 hp flattie. The first approximately 500 miles was with the stock 4.11's. I ordered the 3.54 ring and pinion within 1 week of buying the car. The last 19,500 miles was with the 3.54's. I was never unhappy with the 3.54's.
If it was my truck my choice would be to find a 3.50 3rd member for the 9 inch and put it in the truck.