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proper gearing for 35s

JohnDeere

JohnDeere

1/2 ton status
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Jan 17, 2006
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Location
Houston, Texas
I have an 85 Blazer with a 350, 7004 trans, 3 inch lift with 33s. Im about to put on 35s super swampers and want to change out the crap 3.08 gearing and put in a 4.56 or 4.10 but would a 4.56 be to much. I was told that 4.88s would be good since i have overdrive and maybe i should go 5.13 but i think thats way 2 low
 
It has a lot to do with what you do with your vehicle, there is no single correct answer. You did'nt say but you prob. have a 208 t- case. Me, I would go with the 4.56 gears. If you use it for a daily driver I think it would be a dog around town with the 4.10's. Give us more info.
 
I run 4.10's on mine but that's with a TH400/241. Does fine on the highway and trail, but 4.56's would be better IMO.
 
it will be my daily drive but i take it about once every 2 weeks on and old washed out dirt bike track thats gets pretty muddy9 got my jeep stuck there all the way to the lower part of the door took to broncos to pull me out. but i was told that 4.56 might be bad cause that might cause the transmision to shift from 3rd to overdrive more often. I dont do alot of highway driving but when i do i usly run 70 mph and i dont want the rpms to be way up high.
 
JohnDeere said:
it will be my daily drive but i take it about once every 2 weeks on and old washed out dirt bike track thats gets pretty muddy9 got my jeep stuck there all the way to the lower part of the door took to broncos to pull me out. but i was told that 4.56 might be bad cause that might cause the transmision to shift from 3rd to overdrive more often. I dont do alot of highway driving but when i do i usly run 70 mph and i dont want the rpms to be way up high.
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I'm no auto tranny guy but I recall hearing about some mod. or gizmo you can do to eliminate the tranny hunting between the gears.
 
You have overdrive go 4.88s. That will put you around 2400 RPM at 70 MPH. I think that is perfect. 4.56s will run around 2250, not a big difference.
 
theperfectgarage said:
It has a lot to do with what you do with your vehicle, there is no single correct answer. You did'nt say but you prob. have a 208 t- case. Me, I would go with the 4.56 gears. If you use it for a daily driver I think it would be a dog around town with the 4.10's. Give us more info.
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Fine around town in my case - need to be hauling arse to pull OD tho.


4.56s at least :wink1:
 
i ran 373's with 35s, didnt seem like a dog, but it was tbi, not carb. according to the charts, 456 is about the same as stock.
 
go 4:88. i just had my truck, with the same set up as yours, regeared to 4:56. when going up hills on the freeway she tends to shift in and out of OD more than i would like. then again, either or is better than stock.
 
Bubba Ray Boudreaux said:
And y'all don't have anything called hills back that way either:D
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well she would cherp the tires from a stop, that was good enough for me :p:
 
yeah i dont have alot of hills round here i rarley see any the only time is i go to Garner state park and Thats in South west Texas but but those hills arent that bad. im realy think about the 4.56 my dad said that it will make it suck gas so i should go with 4.10 but it has 3.08 and i get a little beter than 10 miles a galon so i realy dont care about gas anymore.
 
4.56 would be significantly easier on your transmission than 4.10's. Since your tranny is probably a weak link, I would go at least 4.56 to not over heat/destroy the tranny in overdrive. I'm not saying you have to go this deep, and many have run 4.10's with no problem, but if it were me I would go 4.56's for better acceleration and peace of mind. The fuel sucking probably won't be that big of a difference. Fuel might even be better with 4.56's because the engine will be operating closer to its optimal rpm range at cruising speeds. Hope my rambling might have helped give you a big of insight.
thanks,
James

PS: since you have OD I would be tempted to go 4.88 or even 5.13 :wink1:
 
My plan is to go with 4.88's with 35's and a 700r4. my car came stock with 3.73's and a th350. I figured that with 4.88's with 35 inch tires and a 700r4, my freeway rpm's would be exactly the same as if I had stock th350 trans, stock size tires, and approx 3.42 gears (even though nobody makes gears that size that I am aware of). I was tempted to go with 5.13's, but ended up with 4.88's. I would not consider anything numerically lower than 4.56 - and there are posts from people running that setup wishing they had more gear.

go 4.88
 
not to hijack but i have a 76 that i bought in july that has 33's with stock gears, not sure wat they are.
what gears should i go with when i get 35's or maby bigger in the near future?
400sb, th350,np203 stock 12bt and d44
also any ideas as to what my gears are?
 
thanks guys ill more than likely go with the 4.56 cause next summer im probly going to stroke it to a 383 and put vortec heads on it so that will be pleanty power for me
 
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