Posi unit spring question

[ElmoBlats]

Putting my posi unit back together after replacing the spider gears.
Just curious if anybody has any tips for re inserting the springs that sit between the plates that fit around the cross shaft pin. Seems like it's gonna be a pain for sure.

[bryant]

i clamp it in a vice and use 4 zip ties to hold it together then it can be tapped in with a mallet.

[Craig510]

I do the same thing but use a hose clamp to hold it.

[ElmoBlats]

Thanks for the replies. I ended up doing something similar. Clamped it in a vice and tied it with electrical wire and cut the wires off as I worked it in. But I realized after the fact that I had the 800 lb springs which I think is gonna be too much.

[ElmoBlats]

Whoever had the rearend before me must have had it in a strictly drag car. The thing was shimmed ridiculously tight. I don't even know how they got it put together. With how tight it was shimmed and then those 800 lb springs I'm not surprised the spider gears exploded.

[1BADBET]

Were the spider gears heat treated? (Might be why they broke) I just tore apart my new moroso brute force posi to clean it since it had been sitting and I'm trying to sell it. 800lb springs, 22 clutch, it's also got heat treated spiders and cross shaft. They should be black in color if they're heat treated I believe (mine are) I used a set of big adjustable pliers to compress the springs while my buddy tapped it in. Probably the easiest and fastest way but you kinda need a big ol gorilla grip lol. Also use the gear lube moroso recommends (theirs or GM) if you don't you got 99% chance the thing is going to chatter like crazy

[ElmoBlats]

Yeah I don't think the previous spider gears were heat treated. The new ones are. Once you got the springs in were you still able to spin the gears under your own force? Mine seemed shimmed perfectly but once I inserted the springs it seemed pretty much locked up. Not sure if this is normal or not. I'm assuming it would spin under some force or with a cheater bar or something.

[1BADBET]

The springs engage the clutches so you wouldn't be able to turn them by hand. When in the car and going around a corner it will spin when the force of the tire exceeds the force of the springs. With 800lb springs and street tires there's probably going to be some chatter but if you use the gm oil it helps a ton. I've even put the gm additive in a dodge with a new rear that chattered after a quick trip around the block chatter gone... Don't think that one had the big springs tho...

[ElmoBlats]

The springs engage the clutches so you wouldn't be able to turn them by hand. When in the car and going around a corner it will spin when the force of the tire exceeds the force of the springs. With 800lb springs and street tires there's probably going to be some chatter but if you use the gm oil it helps a ton. I've even put the gm additive in a dodge with a new rear that chattered after a quick trip around the block chatter gone... Don't think that one had the big springs tho...

Thanks, just the info I've been looking for. I was thinking of replacing the 800 lb springs with the 200 or 400 but I'm not sure. So basically the 800 lb springs are just going to help it lock up easier? I'm also assuming the 800 lb springs in a street vehicle are going to produce more wear on the clutches?

[1BADBET]

The bigger springs keep the clutches from slipping, so it may chatter on turns but stay locked better for straight line performance. They also have more clutches so they won't wear out faster than one with softer springs. Mine has 22 clutches, with the 800lb springs yours should too, if not I'd recommend going with a softer spring so it will last.

[ElmoBlats]

The bigger springs keep the clutches from slipping, so it may chatter on turns but stay locked better for straight line performance. They also have more clutches so they won't wear out faster than one with softer springs. Mine has 22 clutches, with the 800lb springs yours should too, if not I'd recommend going with a softer spring so it will last.

Great, thanks for all the info.