Transfer Case Differences on 80 Series (1 Viewer)

[84lumberman]

So this is probably what you're talking about. I put the vehicle on a lift and while in neutral I turn the driveshaft and I look inside the differential and it's turning but the wheels are not moving and it seems like they're making somewhat of a grinding noise but not really bad.

If this sounds like the problem, is there a post for the fix and the parts needed?

 

[-Spike-]

If this sounds like the problem, is there a post for the fix and the parts needed?

There are lots of posts, just search 'drive flange'.

 

[NewToFJs]

Your 1993 FZJ80 case is HF2AV. It has a viscous coupler in the rear housing, that's why its longer.

The HDJ80 can have 3 different cases depending on the market where it came from. Most likely either the part time HF1A (in which case the gears you bought will not be compatible), or the HF2A, which is the same case as the HF2AV, but without the viscous coupler. PTO access plate makes no difference in your case (other than the obvious fact that you wont be able to bolt the PTO to the case without it).

Which one is better will depend on how you're using the truck. I personally think the HF2AV is the best case, but some people have a different opinion.

Are the HF2A and the HF2AV interchangeable without further modifications? Meaning could a 1992 transfer case be bolted up to a 1991 FJ80?

 

[mudgudgeon]

Are the HF2A and the HF2AV interchangeable without further modifications? Meaning could a 1992 transfer case be bolted up to a 1991 FJ80?

Yes, but you'll need a shorter rear drive shaft to suit.
The HF2AV has a longer rear housing for the viscous coupler.

 

[NewToFJs]

Yes, but you'll need a shorter rear drive shaft to suit.
The HF2AV has a longer rear housing for the viscous coupler.

Thanks much!

I can probably get a new driveshaft made locally, it might be well worth it.

 

[sunrk]

Not sure about USA, but here in oz HF1A is for factory part time and has no CDL with electronic activation.

 

[wrxFTWdey]

I didn’t want to start a new thread so I’ll just ask here and hope for the best. I got a hjd80 h151 from Europe. I always assumed I had a hf2a non viscous due to it being a factory manual, but after looking at photos online it’s looking like I have a hf2av. Can anyone confirm that this is indeed the hf2av?

 

[mudgudgeon]

There should be a build plate on the firewall with transmission codes.
What does it show?

Some pics here

Thread 'Identification help - HF2AV transfer case' Identification help - HF2AV transfer case - https://forum.ih8mud.com/threads/identification-help-hf2av-transfer-case.1184690/

 

[OGBeno]

HF2AV

 

[FlyinFaded]

HF1A is part time
HF2A is full-time 4x4/AWD

Is this a pretty accurate statement? I’m doing an LS swap on my truck and I am looking at Marks 4wd adapters. I can’t find any identifying info on my transfer case

 

[sunrk]

My 80 (1992 DX) has a hf1a which is factory part-time with no viscous coupling and no centre diff. Uses Aisin manual hubs on the front instead of the drive flanges that full time 4wd 80's get.

It's a very simple unit mechanically, but it's beyond my skill and ability to work on to do any sort of rebuilding or repairs properly.

 

[ikarus]

Alright super specific question of the day - anyone here have a late model ('96-97) 80 Series VX or VX Limited with a manual transmission? And if so, which transfer case do you have - HF2A or HF2AV?

Just figuring out driveshaft lengths for a manual swap. I can measure it once I have everything in the shop but I figured I'd get a jump on it if anyone knows. Been studying BaT photos and saw an HF2A on a '95 and I think an HF2AV on a '97 but the pics weren't great.

 

[chelo]

Alright super specific question of the day - anyone here have a late model ('96-97) 80 Series VX or VX Limited with a manual transmission? And if so, which transfer case do you have - HF2A or HF2AV?

Just figuring out driveshaft lengths for a manual swap. I can measure it once I have everything in the shop but I figured I'd get a jump on it if anyone knows. Been studying BaT photos and saw an HF2A on a '95 and I think an HF2AV on a '97 but the pics weren't great.

Full time or part time?

 

[ikarus]

Full time or part time?

Full time.