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Got a 6l LS2 going into a GU manual and it currently has 4.6 diffs. Im thinking the gearing will be too low. Will be running a combination of 33's and 35's.
Anyone recommend a good starting point for diff ratios ? 4.3's 4.1's ?
I’d say 4.3 for 33s & 4.6 for 35s would be perfect. 4.3s Would be a good compromise overall. I wouldn’t go any higher than the 4.6s because you will suffer on the open roads, especially when running 33s. Try what you have got & work it out from there.
I had 4:3's on my gu ute 4.2td for 35's and they were perfect. I thought that with the 6l having a bit more grunt 4:1's would be closer. I guess ill just have to wait and see
With 35s & 4.11s you will be on about 1800rpm at 100k’s. I think that’s too low for a heavy truck. It might have more grunt than your diesel but not at 1800rpm. 2200 to 2500rpm at 100k’s would be good, the v8s like to rev.
I run 35's and 4.1's with an ls1 . Its was perfect when it was a N/A engine and its still perfect with forced induction on it. Just go with the 4.1's and if your going to use 37's go for the 4.3's or 4.6's.
Cheers
Gouldy
GQ. Supercharged LSX 427, 500rwkw. camtech cam,90mm Holley Throttle Body. twin 4"exhaust, big fuel system, King bypass shocks and bumpstops.
Holtrol wrote:With 35s & 4.11s you will be on about 1800rpm at 100k’s. I think that’s too low for a heavy truck. It might have more grunt than your diesel but not at 1800rpm. 2200 to 2500rpm at 100k’s would be good, the v8s like to rev.
I think you will find the ls2 will have much more torque then a td42t at 1800rpm if you have a look at the power curves
