wvumtnbkr Posted June 9, 2017 Report Share Posted June 9, 2017 So, our chumpcar has a gm 3400 v6 with a 1999 camaro v6 t5 trans behind it. Our tire size is 23 inches. Rear is a 4.10. Apparently, t5s don't like to shift into 5th at high rpms and high load. The 5th gear synchro assembly is brass unlike 1 through 4. We can not get it to shift into 5th under load without horrible noises, even granny shifting. Any ideas? I have been googling all day and came up with nothing. We have tried red line d4 atf and mtl to help. No difference. We have a pro 5.0 shifter. No difference. We verified clutch and assembly are working properly. I could drop 2k on a Ford 8.8 Rear end and kit and buy and install 3.08 or 3.23 gears and never use 5th. I could adapt a different trans too. I have a turbo ii trans that looks like not too much work to adapt, but will 5th gear hold up? No idea. Lots of work for nothing if it is doesn't! What about an ax15 or ma5? Anybody? Tire size works well for our car and not likely to change. Link to comment Share on other sites More sharing options...
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