ProTrans350 transmission and Rear Gearing

bert powell · 02-28-2019, 02:41 PM

So thinking about how to gear a SS 3250# Camaro with 402/308 BBC combo? With all the gear ratios available for ProTrans350, how do you decide what 1st and 2nd gear ratio is needed? What about rear gear?

Is starting line ratio still used? If so, what are you looking for? I hear of people having from 2.10-2.75 low gear, wondering what trends are now?

Dave Noll · 02-28-2019, 05:39 PM

My car is a lower classed stocker that hasn't run the index, ...... YET. (Its a 2bbl combo) I have a low gearset in its C4 and with the difference it's made, it is staying in there. Its lower than the 2.75 that you stated. I have read on this forum of some comp eliminator cars that are in 4th or 5th gear by the 330. I read in ND once a while back a tech article by WJ. In it he said to gear (rear) 5% over the point that the HP starts to fall off. I've read similar views posted here on ClassRacer.

SDT1DYI · 02-28-2019, 09:27 PM

Does Pro Trans still offer a free one time gear change when you purchase a new transmission? Helps when your starting with a new combo.
Good Luck.....

Steve. STK. 6380.

02-28-2019, 02:41 PM	#1
bert powell Member Join Date: Jul 2002 Posts: 241 Likes: 35 Liked 33 Times in 11 Posts	ProTrans350 transmission and Rear Gearing So thinking about how to gear a SS 3250# Camaro with 402/308 BBC combo? With all the gear ratios available for ProTrans350, how do you decide what 1st and 2nd gear ratio is needed? What about rear gear? Is starting line ratio still used? If so, what are you looking for? I hear of people having from 2.10-2.75 low gear, wondering what trends are now?

02-28-2019, 05:39 PM	#2
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 696 Likes: 2,309 Liked 220 Times in 105 Posts	Re: ProTrans350 transmission and Rear Gearing My car is a lower classed stocker that hasn't run the index, ...... YET. (Its a 2bbl combo) I have a low gearset in its C4 and with the difference it's made, it is staying in there. Its lower than the 2.75 that you stated. I have read on this forum of some comp eliminator cars that are in 4th or 5th gear by the 330. I read in ND once a while back a tech article by WJ. In it he said to gear (rear) 5% over the point that the HP starts to fall off. I've read similar views posted here on ClassRacer. __________________ Dave Noll, E/FS ,L/SA 6526

02-28-2019, 09:27 PM	#3
SDT1DYI Member Join Date: Nov 2016 Location: Indianola Washington Posts: 359 Likes: 0 Liked 396 Times in 126 Posts	Re: ProTrans350 transmission and Rear Gearing Does Pro Trans still offer a free one time gear change when you purchase a new transmission? Helps when your starting with a new combo. Good Luck..... Steve. STK. 6380.