98tdi

iTrader: (1)

i just measured mine with the rear housing off. From the front bell housing to the tip of the bare output shaft it is right at 32 3/4' to 33''
the output shaft is 32 spline.
also it measures 7'' from the tip of the output shaft to the mounting of the rear tail housing..


here is all the Brake tail housing peices removed..


and here is my lastest toy..

98tdi

iTrader: (1)

Anyone have any insight on what to do with the tail housing??

1FastBrick

iTrader: (17)

Should be able to buy a 2WD tail housing and use a bolt on yoke. Just make sure it seats all the way inside before bolting it down. If not you could be forcing it on and damage the shaft.

98tdi

iTrader: (1)

I measured the 2wd 1/2 ton tail housing and it is 6.75'' versus my 7''
That wont work, also if i used a bolt on yoke wont it mess up the ujoint since it can't "slip" on the yoke? i.e. if the truck is loaded down wont that make the drive shaft either go in or out of the trans? if it does then my bolted down yoke will not work and it will put excessive stress on the ujoints or rear end?

1989k1500

iTrader: (23)

You have to have a driveshaft made with a slip joint in it. Otherwise you'll never get the driveshaft in the truck anyway.

98tdi

iTrader: (1)

Called up precision built here in Kc and they said they dont recomend that style of shaft for this application due to rotational mass of the hefty driveshaft with the slip yoke built in. Looks like i will be stopping my build untill i can fund a different transmision.. On the bright side this trans has straight cut gears, not helical cut!

Vince B

iTrader: (1)

Just wanted to update this thread. I believe from what I was told today that the shaft in this trans is longer than what is in a factory 80E. Also I converted one of these units once and it did not have the parking pawl and other components that are normally in these units for park to work. So if you plan on using one of these units I would get these parts to do the conversion and unfortunately you will have to fully disassemble the unit to do this.

1FastBrick

iTrader: (17)

Save your pennies and have them put the rear shaft for a sliding slip yoke in and what ever other parts it might need.

Jake's Performance

iTrader: (2)

This is a factory 4L80E Vince. We've had this discussion before and I mentioned this specifically. The 4L80E's with the parking brake on the rear may have a shaft that is approx 1" longer than a regular RWD unit, as seen here.

Jake's Performance

iTrader: (2)

https://www.performancetrucks.net/fo...sbrake-481102/

I mentioned it in this thread as well. Good picture showing the difference with a RWD tailhousing on and some unscrupulous build practices.

I will also mention that square cut planets really aren't an upgrade for most applications. There is a myth that they are stronger when they are in fact weaker than a helical cut gear. They also don't lubricate as well.

They are still plenty strong enough as the 400/4L80E planets are overdesigned but there is no reason to go to great lengths to use them. If there was GM would have used them in everything because they are easier (cheaper) to produce.

They don't thrust load, so they work good in HEAVY vehicles to prevent thrust washer wear.