3.42:1 VS 3.73:1, notice a difference?

[Samckitt]

Is there that much of a difference to notice a difference between the two?

[nightrunner]

its hard to. usually not enough to warrant the cost of changing them out

[Samckitt]

And I am betting that 4.10's won't work on the same center section as the 3.42's....?

[nightrunner]

im not familiar with the GN rear that you have listed in your sig but i know that 4.10s USUALLY fit. i know that they will on the 8.6" GM 10-bolt. (im used to working on the 99-06 gm trucks)

if they list them in the catalog of where ever you are getting them at they will fit.

[68Formula]

Guy I know who had put in 4.10s with his T56 wished he had went with 3.73s. IIRC he stated the first gear was useless.

I've heard a 10:1 overall 1st gear is ideal. That would put you with 3.36s in the rear. Sounds like 3.42s are your best bet.

[nightrunner]

yes but it also makes it "lug down" with very low rpms in 6th with a t56, depending on tire size. forcing you to downshift when going up some small hills, etc.

[68Formula]

I had thought the overdrive ratio was .62:1 on the LT1s, but I found information that said they had .5 in the later years.

In the case of the .5 overdrive, I'd agree the 3.73 gears would be a better choice. But with .62 ratio, the 3.42s would still work well.