I don't know anything about SPPrecision.com. Hopefully the members on the forum can give you some good leads.
Kansas, I apologize ahead of time if I am telling you things you already know about. Based on the advice from the shop that is rebuilding my truck I went with the 3.73 12 bolt chevy rearend and a 0.76 overdrive in the T5. There are so many different T5's that you will want to know what gear ratios you are getting and how they will work with you differential. Here are some recommendations from the lugnutz65chevy website (website link is given below). Good gear combinations for an inline 6 engine (listed in order of preference) 3.73 rear diff with 0.72, 0.73 or 0.76 overdrive 3.90 rear diff with 0.72, 0.73 or 0.76 overdrive 3.07 or 3.08 rear diff with 0.86 overdrive 3.42 rear diff with 0.76 or 0.86 overdrive 3.55 rear diff with 0.76 or 0.86 overdrive Based on the tag id on my T5 and the britishv8.org website (given below) these are the specs they listed for my T5. tag id: 1352-216 GM 1993 MY 2.2L S-Truck WC (world cl***) reverse: 3.76 1st: 4.03 2nd: 2.37 3rd: 1.49 4th: 1.00 5th: 0.76 Here are a couple of links that I came across when I was researching T5's. These articles are well worth the time it takes to read them: http://www.britishv8.org/Articles/Borg-Warner-T5-ID-Tags.htm https://lugnutz65chevystepside.weebly.com/t5-info-page.html Kansas, keep in mind that I am in no way an expert on these topics. I am simply telling you what I did so you have some kind of reference. It has been quite a learning experience for me but one that I have enjoyed.
The Jalopy Journal
