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Help in iraq

DumontsK5

DumontsK5

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Jul 26, 2006
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Location
williamsburg, VA
I am in Iraq looking to order lockers and 4.56 gears can anyone tell me what came stock in a 1986 k5? is it 7.5 or 8.5? and how many spline?

any help will be greatly appreciated!
 
8.5" 28 spline.

If the trucks not the original to you, I might wait, since it's fairly common for those axles to be replaced. (so could be a 30 spline) Besides, if it's a gov-lock, that means you've got to get another carrier, right?
 
hey man thanks i know the 1st owner he owner it 17 years so the axles havent been changed he didnt wheel with it! whats gov-lock?
 
stock in an 85 k5 has 10 bolts front and rear. Rear 30 spline, front 28 spline both are 8.5" ring gears. The carrier gets removed in 10 bolts in place of a new locker, so gov bomb doesnt matter. Gov bomb is a factory locker in the rear of the truck it is a gov lock to be quite honest, they suck. code on the build sheet is G80. The only time you need a new carrier for a detroit is for 14 bolt full floaters. If your ordering new lockers front and rear with new gears make sure they sell you the correct part numbers for the gears that will be on there. If your ordering a new rear locker only and gears to match both axle's, you will then need a 4.10 and up open carrier for the front to make the front gears bolt up or buy thick gears to bolt to the existing carrier. do you know what gears are already in there?
 
I am looking into ordering 4.56 gears and a locker for the rear with a selectable for the front! you guys helped me out alot!

the gears in there now are 3.73

another question what is better a NP241 or a 208?
 
I believe most would consider the 241 slightly better, but probably not enough to swap the 208 for a 241 unless the 208 was broken.

It's got some real advantages over the 208, but until you start talking about things like slip yoke eliminators, the 208 will probably be plenty good. :)
 
i wouldn't spend the $ on a 10 bolt rear... swap in a 6-lug semi-floating 14b rear. Its stronger and will bolt right in. The 10 bolt rear is pretty much the worst axle ever put in a full size truck... lockers + tires over 31" = ka-boom.

241 is better... but as previously noted, unless you are going to use a SYE, if you have a working 208 now just keep it. Only thing wrong with the 208 is the crappy slip yoke. 241s have slip yoke stock also.. so no real gain in the swap unless you are going to change it to fixed. A fixed yoke 241 is a damn fine tcase... just skid plate it to protect the aluminum case from rocks!

j
 
Thats a good idea considering i just ordered 37"tires! where can i find a 14b semi-floating rear and what do i do to the front?
 
If your going to swap axles go with a 14 bolt full floater. for the money it is the best axle for the rear. And if you look around you might find one with a Detroit and 4.56 gears already. That would save $$$.
 
Jackedup86GMC said:
If your going to swap axles go with a 14 bolt full floater. for the money it is the best axle for the rear. And if you look around you might find one with a Detroit and 4.56 gears already. That would save $$$.
Click to expand...
I bought a 14bff with 4.56 and detroit w/ ~ 30000 miles for $500 when I bought mine. Definately cheaper in the long run.

John
 
yes, but going with a ff14b requires new wheels and stuff also. The ff14b is the best common rear axle you'll find for a chevy... but it isn't a bolt in swap. Something to consider. If you don't mind the extra work and buying new wheels, sure, go for the ff14b. Its what I run.

I guess the key is, no matter what you do, don't pour $$$ into a 10 bolt rear axle.

Front axle is up to you... is 37" tires going to be the limit? If so, chromo shafts/joints etc will keep a 10 bolt alive. If you are going to eventually run tires bigger than 37s... or run hardcore rocks, save yourself the $ and just go Dana 60 now.

j
 
im running 37"s for now if anything ill stay at a 35 or 37 no bigger im tring to keep it legal so i guess ill build up the 10 bolt! i dont do anything major! just muddin and trailin to camp! thats all! ill just carry some extra shafts and parts with me!
 
You could put a Lockright auto locker in the Front 10b about $200 I think. I run 35's and have had no problems.
 
Last edited:
DumontsK5 said:
im running 37"s for now if anything ill stay at a 35 or 37 no bigger im tring to keep it legal so i guess ill build up the 10 bolt! i dont do anything major! just muddin and trailin to camp! thats all! ill just carry some extra shafts and parts with me!
Click to expand...

if that is the case, yeah... keep the front 10-bolt. I'd still swap in a sf14b rear though... definitely stronger than a stock 10-bolt, good ground clearance etc. Not sure what lockers are available for the sf14b... but lockers + 10-bolt rear = kaBoom. The other alternative would be to leave your 10 bolt rear open-diff... that'd work too.

Its your rig.. do what ya want... I just can't recommend putting a bunch of coin into a 10b rear. Regear + locker is gonna be quite a bit of $...

j
 
well i ran across a 14bff with 4.56/detroit locker/ and had a disk brake conversion so i scarfed it up its brand new for 750$ !! Was that a deal? now how much work do i have to do to swap it out with the stock 10 bolt?
 
if its new its a good price. I actually paid $700 for a brand new ff14b with 4.56s/detroit but regular old drum brakes. ;)

At any rate, how much work it will require depends on the ff14b. Some have spring perches in the "right" spot, others don't and they will have to be moved. Its not hard... lots of grinder action will get the factory one off... and you can get brand new fabricated ones cheap (DIY / Ruffstuff in the vendor forums!). Just need to weld 'em on.

j
 
the guy who sold it to me swaped it around for me! do i need to order a new yoke for it or will the stock drive shaft bolt right up to it!?
 
you will probably need a conversion u-joint for the time being... after that you should convert your driveshaft, not the ff14b... its yoke is larger.

j
 
Ya found the Guy I was going to suggest. He answered several questions for me so he should help out and actual buyer.

BTW, this guy is getting new 14b from Mil surplus and using his disc convert parts. They also come with Detroit Lockers installed:laugh:

Great deal unless you ship to Los Angeles. $450:eek1::rolleyes:
 
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