Changing Gears

[rgnbull1227]

Hmm. I was told it was the ZF 8.8 rear.

Actually just checked with SPF and they said they think I have a 3.46 diff ratio. Would that be the borg warner?

[Mark IV]

Originally Posted by rgnbull1227

Hmm. I was told it was the ZF 8.8 rear.

Actually just checked with SPF and they said they think I have a 3.46 diff ratio. Would that be the borg warner?

Your car has the Dana "GTO" diff, the ZFs start in the higher 2900s. You have a 3.46 ratio. You can install any gearset that fits the HydraTrak diff, some are available via GM and there may be some aftermarket. Do a little Googling and you wil get some info.

The "8.8" is the early Ford(T-Bird) diff used until they switched to the Dana

[bulletbrown]

If you have a GM GTO , which is the same as the new Camaro, I would up grade the unit to stand up to that much power. It is a wonder you have not blown it aready. It is not a strong unit to begin with . I sell Camaros and we have repair a number of this unit on stock Camaro,s . We sell Camaro to Nickey custom Camaro builders and then change half shafts ect. in the hopes they will hold up to the added power of the supercharges they install. If you put a low gear ratio and sticky tires you will blow it to pieces . There is venders that will sell you the badly need up grades.

[STL Mark]

Originally Posted by bulletbrown

If you have a GM GTO , which is the same as the new Camaro, I would up grade the unit to stand up to that much power. It is a wonder you have not blown it aready. It is not a strong unit to begin with . I sell Camaros and we have repair a number of this unit on stock Camaro,s . We sell Camaro to Nickey custom Camaro builders and then change half shafts ect. in the hopes they will hold up to the added power of the supercharges they install. If you put a low gear ratio and sticky tires you will blow it to pieces . There is venders that will sell you the badly need up grades.

No worries. I run Goodyear Eagle GT IIs. Basically the tires don't stick. So, I'm never in danger of destroying the rear end or the axles. If I needed a rear end that would hold up to full-on drag passes, I would pull the whole mess out and re-build with a much more substantial system. But, I have managed an 11.3 pass on those street tires. As it is, the 3.46 is a good road racing platform for now. On the track, even with Hoosiers - the stock SPF (Dana/GTO/whatever) does fine.