I am building a hybrid truck. I have a 77 Chevy with 350/350 - 203 part time kit. I am putting 60/14 bolt with 4:56 gears.....I was wondering what experience have you guys had running this gear with 39.5 swampers.

I come from the Toyota board, but I am now building a Chevy and I do not have as much knowledge dealing with Chevy's....

Thanks for any help given.

Should be fine with that combo....Lock the front at least......good luck building.....

Originally posted by Shaker
Should be fine with that combo....Lock the front at least......good luck building.....

Hey tim when are we getting an update on your k5 project? Itll be time to go beat on that thing before ya know it. :D

l8r -j-rOd

I am going to weld the rear and Detroit the front.
I figure if I feel the need for more gearing, I could always add a 205 case.....

Originally posted by jhama78


Hey tim when are we getting an update on your k5 project? Itll be time to go beat on that thing before ya know it. :D

l8r -j-rOd

ITS snowing I aint workn on any of my junk....busy doing customers

Depends on weight and the motor (power and low-rpm friendlyness), but I'd say it would be a little under geared. Crawl ratio would be 2.52 x 2 x 4.56 = 23:1. I run 39.5s with 4.56s, but with a 700 and a 241 (was a 208 until last summer), 3.06 x 2.72 (2.61) x 4.56 = 38:1 (36.4:1). It works for me, but I wouldn't mind a little more. Motor is a stock 350 TBI, and I can hit 6k loaded for the trail easily.

Pete

I'd recommend 4.88 or 5.13 myself. I have 4.56, but I have a 402, and it's mod'd. I am opting for more motor mod's rather than gears. I still might get the gears though.

I have 4.88s and they are EASILY enough to turn my 39s with a 350. I pretty easily light up the rear, so i think he'll be fine with 4.56 unless he's rock crawling.

I will be removing the entire body and placing on a S-10 Cab only.......That shoudl shave several pounds. The motor is stock ( as far as I know)

I will be putting a exo cage on the truck, which will add back a little weight.

I am in the east,,,,not many rocks here

Thanks for teh input...

I dunno about with a TH 350, but my SM 465 works quite well with my 3.73 and 38" tires behind a mildly built 350. I think 4.56 will be fine.

SM456 has a 6.55 first gear, as compared to a 2.51 ( i think) TH350. So I'm not surprised.

good point bowtie. I run 4.56 with 700r4 and 208(currently) and I can only spin them well in compound low with a tired 350. I would not want anything lower then my compund low though, plenty for me.


Charlo

Originally posted by BowtieRed
SM456 has a 6.55 first gear, as compared to a 2.51 ( i think) TH350. So I'm not surprised.

2.52 first in the TH 350 but don't forget almost 2:1 for the convertor.

BTW, I forgot to mention that I NEVER use low gear in that tranny. It is totally useless unless I am coming down a hill.

3.58:1 works just fine

should be fine. I just installed 60/14b with 4.56 and 39.5 tsl's on my 79 k5. Very mild 350 (Crane High energy cam, performer intake) pulls just fine up hills, able to accelerate up modest hills in drive.

i run 39.5 bogger on my 95 Z71. i have tbi 350 and 4l60e with 4.56 gears. they seem to do alright

I have been running 39.5 swampers for years with 4.56 gears in my 79 chevy, I read somewhere the 4.56 gear is the "economy" gear for a 40" tire, the 5:30 being a "performance" gear. but the deapest you'll get for the 14 bolt is a 5:13.
Good Luck, post some pics as you go, I'd like to see how you do it.

I will post some pics......Currently the only thing left on truck is the cab hull, the doors,fenders,bed etc...is all removed.

We plan on removing the cab this weekend and pressure washing the entire drivetrain and frame - Then the work begins....

I will get some pics this weekend and try and keep them updated weekly

I have purchased the D60/14 bolt, locked front/rear with a set of grooved 39.5 swampers. I will be running full hydraulic steering...have not decided what springs I will run yet.

Thanks for the replies so far..Jim

Update:

I have been working night and day on my truck. I have the S-10 cab on, drivetrain in, radiator mounted etc......I still need to get my steering, front driveshaft, paint and exo cage.

I was tinkering around in the yard, I was not able to do much because of no steering, but the truck seems to have plenty of power.

BTW: if someone can give me there e-mail, I will send some pics to be posted.

I ended up getting a shortened suburban frame, ORD shackle flip and 4" springs up front.

Originally posted by TN85YOTA
Update:

I have been working night and day on my truck. I have the S-10 cab on, drivetrain in, radiator mounted etc......I still need to get my steering, front driveshaft, paint and exo cage.

I was tinkering around in the yard, I was not able to do much because of no steering, but the truck seems to have plenty of power.

BTW: if someone can give me there e-mail, I will send some pics to be posted.

I ended up getting a shortened suburban frame, ORD shackle flip and 4" springs up front.

hit me at jhama78@hotmail.com

sounds good can't wait to see pics..:D

If I was to do it again, I'd go with 5.13, just because it's even lower. But since I have 4.56 gears, and it's low enough for now, I'm not changing until I get the d60 finished... and started.:flipoff2:

I run a hybrid - toy/k5, exocage, 44"tsls, sb350, sm465, 4.56 gear setup and it works very well. However down in moab and on the snow I do use my 2nd t-case. That extra gearing (120:1 I think) makes things alot easier, you can just keep your foot off the clutch and idle through the nasty spots.

got pics?

well a buddy of mine runns 4.56s whith 39.5 boggers and a 454(its kinda tired). As long as you you dont try to go hill climbing whith out lockers your good. If you going to be doing anny heavy climbing like that youll probly whant a rear locker (but then again when dont you whant a locker:flipoff2: ).
That set up should work vary well.

my truck (http://www.4x4wire.com/cgi-bin/gallery/imageFolio.cgi?action=view&link=readers_rigs/GM&image=j_johnson.jpg&img=12&tt=)