1986 3/4 ton, 6'' lift on 33s, 350 Th400 Np208, 10bolt front and 14 bolt sf rear. I dont no the gear ratio on the factory tag it says that it came with 410s. When i am giong 70 mph it runs at 3500rpm i have never had a 3 speed automatic tranny before so the rpms seem extremly high and it sucks on the fuel milage i only get about 6 1/2 mpg. Do the rpms sound about rght for the drive train setup are does anyone think that it might have had lower gears installed?
CK5
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Just bought a suburban.
- Thread starter Anthony84
- Start date
http://www.grimmjeeper.com/gears.html
great toy to play with.
that combo is showing 3100 rpm at 70mph
sure the tack is correct ?
and welcome.
great toy to play with.
that combo is showing 3100 rpm at 70mph
sure the tack is correct ?
and welcome.
I havnt tried a different tack yet i have only had it for about a month. As for going with bigger tires i want to try to weight for now it had new tires on it when i bought it, and when i get new ones i would like to get some wide 38s. how much lift would i need for 38s with out cutting the fenders? I am also looking for front and rear winch bumpers.
Welcome to the site. Without cutting the fenders, you might be able to get by with the lift you have now and a 1 inch body lift from ORD or DIY4X. A lot of guys on here are more geared towards the fender cuts, and if done right it can look factory. Do a search and check out some of the other Burbs and Blazers on here and that should give yo a good start.
83SuperBurb
Registered Member
This is my burban with 6 inch lift and 37 inch hummer oz tires I had to trim quite a bit in the rear to clear at full stuff
TheBeast_88K5
Banned
At them R's with a 6" lift just put some 35"-37" tires on it and you'll be just right
I thinks you haz 4.10's....
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Thats a sweet frickin' Burb!
1BEATK5
1/2 ton status
33" Tires measure more like 32" when loaded. I bet it has 4.10.
My truck had 4.10s and 35s. It was about 3300 at 70. He has an auto trans which would put him in the 3500 range.
Also, how accurate is the Speedo? That can throw off the numbers as well.
My truck had 4.10s and 35s. It was about 3300 at 70. He has an auto trans which would put him in the 3500 range.
Also, how accurate is the Speedo? That can throw off the numbers as well.
83SuperBurb
Registered Member
RollinKaos
1/2 ton status
Thanks was consdering goint 37" MTRs on my burb with a 6" in lift. I didnt know how much trimming would be involved. I dont think my is gonna see to much action most a mall crawler. I love the look on yours and I am sold ! 37" MTRs for me!
TheBeast_88K5
Banned
My bet's on 4.10's.... What's the stakes? 
83SuperBurb
Registered Member
Thanks for the compliment
Make sure you check out Trailworthyfab.com there mtr's are $95 a piece plus the ride they also do recentered H1 wheels
RollinKaos
1/2 ton status
Thanks. Think I linked them off of Pirate awhile back, that was the route I was looking to go.
Can the axles i am running hold up to 38s very good? I never get around rocks. Only highway, mud, and sand. I dont have a big motor and when i swap the one out that i have it probably wont be over 350 to 400 hp. Also what is the biggest tire i could saftly run if i was to install a front locker?
Mrpandazz
Registered Member
Im no expert, but from what Ive read a 10 bolt wont last too long on 38s especially if off road much and adding a locker can shorten its life even more. Not too sure about the 14bsf.
Where in Texas are you located?
Where in Texas are you located?
