VERY different! The 4.10 gear found behind automatic transmissions in 3/4 ton trucks and Suburbans in the late 1960s is about the highest gear that's available for the HO52/72, I believe. I don't think even the aftermarket gear places sell higher ratios. The rock crawler bunch LOVES the 4.56 and lower gears, and they will swap 4.10s for the granny gear ratios if they have them. You might do a little window shopping on swap meets on the off roaders' websites.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!