changing the rear end gear in my 77 dually

well in my truck right now i have a 4.11 gear, and i was wanting to change it so i can get on the highway and do the speed limit without over reving my engine......would it be better to do a 3.73 or a 3.42 ? im not going to be towing alot of heavy things with the truck....or could i leave the 4.11 gear and get a 700r4 ? i have a turbo 350 trans in the truck right now..... thanks

700r4 is the devil in a crew cab dually.....I put 4 in mine within 6 months.....

YEA, I've got a 700R in a 83 truck with the TCI lock up kit and I can't get it to shift right I'm about to rip it out and hunt down a T350






look two post and we've already gone off topic.

I recomend a 400 for those trucks....but thats just my 2cents...

The 400 has overdrive, correct?

[quote="JCampbell1180"]The 400 has overdrive, correct?[/quote

yepp its a hell of a 5-speed.....

alright...lets forget about the devil 700r4... lol so now its between the 3.73 or the 3.42 gear , ive heard of guys putting a 3.73 in and doing good on the interstate but would the 3.42 be to high and bog down the motor at low speeds......?....

no, the 400 is a 3spd like the T350 the 700r is a 4spd its basicly a T400 with a overdrive and electric lock up converter. you can build the 700r to handle the power but you can tie up a lot of money in a hurry


now we can go back to the rearend gears if you want

ok guys a 3.73 or a 3.42 ???? thanks

so out of all you smart guys you cant tell me whats the best gear to use??????? i got more transmision post than anything