Ouch! Well there you go! Driveshaft is definitely too short and TomA was correct. You say it cracked the transmission case too? I hope the transfer case is OK as well and will still hold the bushing and seal. Sounds like kind of a mess to put right again. I would think the lift kit company would give you a heads up about that in the instructions.

Just curious what kind of driveshaft your 69 has in the rear? Front yoke is slip yoke or fixed yoke with center of the driveshaft slipping in/out?

 

Ok I took some pics of my 69 the drive shaft is about the same angle but it's different. Excuse the nasty oil buildup trucks been sitting about a year now starting to leak.

But it slips into itself

About that 17°angle

Fixed attachment

It's lifted same height

 

Yeah I've already dealt with the transferase a piece of the housing broke on it as well, the guy at tranny shop said it could be due to the mechanic hammering on it to separate it to fix the shift fork inside, mechanic said it was already like that but it didn't leak or anything before the shift fork broke. IDK 🤔🤔

The housing after removal.

That back housing broke already once.

Blazer isn't all that high, it's only 6" shouldn't be having these problems.

 

Seems to me you just need a longer driveshaft made (other than fix the broken stuff). The 69 was fine because there was no slip yoke up front to pull out, wobble, and break the TC tailshaft housing. Different design shaft and yoke Good luck! You might want to check the output shaft to make sure it hasn't been bent.

By the way - nice vehicles!

 

Thanks Les, so you think extending the shaft itself can fix this problem cause yes it's come out quite a bit since lifted and maybe some shims to try to get that angle down a bit, I don't do much four Wheeling just mostly want the ground clearance when I go scouting/hunting I pull a trailer as well so I need it to be fixed pretty soon here before the season starts haha.

 

For a cheaper option that MIGHT work, you can get what's called a zero rate add-a-leaf that's simply a 1" block that bolts on the bottom of your leaf spring pack and allows you to adjust the axle position. If you have room in the fenderwell to move it forward a bit, it would help the driveshaft.

 

Yes, I believe so. Either that or moving the axle ahead as TomA suggests. As far as shims, remember that theoretically whatever angle you have at front ujoint - that is the angle you should have at the rear ujoint - so that the net angle is zero. If your rear is already 8 up and your TC is 5 down, then you would need to lower the rear to makethem equal and that would make the driveshaft angles even worse. But I wouldn't worry about shims unless you have a vibration. Driveshaft angles on lifted trucks are typically pretty extreme anyways. You may want to discuss with a driveshaft expert exactly how much engagement the slip yoke should have on the output shaft. If you have a new shaft made, they will tell you exactly what measurements they need you to take.

 

Ok guys I finally found someone on the streets here locally driving the same Blazer as mines newer model but same difference. So it turns out that that guy had purchased an extended slip yoke so instead of the factory slip yoke being whatever the length is as you lift the truck it's pulling it out so buying that extended yoke no need to extend the driveshaft or nothing he said just pop out the joint take off the old slip yoke put the extended one and install says he hasn't had any problems at all. Have any of you heard of that I'll post a picture of one.

 

Personally, I would rather have the driveshaft extended. The longer slip yoke will probably work, but it may be more prone to vibration if there's any play in the tailshaft bushing.

 

Hi guys I'm back, I found a transmission to get this thing back on the road I just want to be sure it's the one that goes to my Blazer I got pics of the bar code with the numbers on it if someone can decode this thing for me. I yet have to clean it up to find some other numbers that should be stamped on the case. This is a one piece case came with transferase (241c) which my Blazer has.