what gears should I use with a TH400

[smokkey1]

I might be getting a killer deal on some brand new 38" swampers from a guy on pirate that's very local to me. anyways, I'm going to have to regear the axles sooner or later. The only time the sub goes on the freeway is to and from the trails and that's it. I'm runnin 36's with 350tbi/th400/np241 and 4.10 gears. So what gears would you guys recommend? I'm thinkin 4.88's.

 

[nau81blazer]

4.88's sound pretty good to me.

 

[trailblazr81]

If no freeway 5.13's Back in the day I knew a guy who ran 5.29's in his Yeep. Had a Mustang 289 and a 4 spd manual with 36's. He'd cruise the freeway at 55 mph.

What axles??

 

[smokkey1]

not much freeway action for it just to the trail and back. other than that it's manly on the street.
5.13's crossed my mind but it might be alittle to deep when I do have to go on the freeway. Tt has a 14ff and a 10bolt front. but will be getting a D60 very soon. I'm not going to trow any money at the 10bolt front.

 

[trailblazr81]

5.13's will put you at about 3000 RPM on the freeway with 38's. In the past Ive done 40 mile blasts at 3200 RPM. Can be a little loud with 450 HP and 40 series Flows, but other than that no probs.

 

[onetonbb74]

if the small block is staying id go 5.13.

 

[smokkey1]

yep, the small block is staying.

 

[muddybuddy]

ive got 5.13s for 42s. i think ud like it better than the 4.88s do it once do it right!!! :-) lock it while ur at it

 

[onetonbb74]

38's with a th400, id go 5.13 w/ a sbc

 

[smokkey1]

ok, I guess 5.13's it is
I'm going to pick up the tires on friday.
I'm runin a spool out back. The front is going to be a D60 that I'm going to be picking up soon.



on the average what dose a gear install coast just for the labor?

 

[jekbrown]

same as with every other trans and every other tire size. 5.13. To this day I kick myself for thinking 4.56s would be a good compromise. Oh well, nothing like spending lots of $ to learn a lesson!

j

 

[smokkey1]

whats a good brand of gears to use?

 

[muddybuddy]

ive got yukons front, genuine in 14b (was during 5.13 shortage all i could find)

 

[jekbrown]

whats a good brand of gears to use?

anything but "Genuine" gears. Yukons are fine, and sanely priced. If you're rich and money is no object, buy some superiors.

j

 

[BranndonC]

good luck finding 5.13's, i hear its impossible

 

[smokkey1]

I was talking to a vendor on here and there expecting to get thick 5.13's this spring. or I can get some thin 5.13's a new carrier and call it a day. I'm not going to be doing this gear swap till april or may at the latest. As long as the sub is ready by blazerfest that's all that matters and that's in july.

 

[mrk5]

I've got 37s and 4.56 in my TH400 rig, and they aren't any too low for highway driving. I would also vote 5.13 with your setup.

I don't know what the cost of carriers are for you axle, but I know a D44 carrier is only about $50. Personally I would buy a new carrier and get the thin gears, especially if there's any question about availability of the thick gears.