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After seeing the two most powerful Grand Prix GT's in North America explode their 4T60E (open) and 4T65E (limited slip) differentials at the starting line, we decided it was time to find a way around this incredibly weak link. We don't have a solution for the 4T60E transaxles used in 1997 GT's yet, but do have a fantastic fix for all 1998 and newer ones with the 4T65E.
Our kit will include everything necessary to convert your entire transaxle output section to an -HD style, as found on the 1997 and newer Grand Prix GTP and Regal GS. The Bonneville SSEi uses even larger components, and we'll keep that in mind as we make more and more power and get more and more traction.
Our first conversion was recently completed in Wes' car, and it's performing very well for him.
The INTENSE™ 4T65E to -HD Conversion Kit is Now Available! Please Click Here!