89 Burb/K5 NP241 vs 89 1Ton NP241?

[AZ_Overdrive]

Except for the front driveshaft drop on different sides, is there a difference between the internal parts?


I have an 89 Burb, NP241 Passenger side drop. Very noisy "poping" and or "thunking" sound when in 4wd.

Possible doner, 89 1 ton with np241, Driver side drop. Wondering if both transfer cases share the same internals.


P. S. Yes, the 1 ton was connected to a 400 and mine to a 700 but planning on dropping in a 400.

Any assistance would be greatly appreciated.


Oh, yea, and one more thing. It is possible to limp a Burb with a blown front transmission seal 200 miles home while using pieces of a turkey pan and bailing wire as exhaust cross-over and cat converter heat shieds. You just have to stop every 30 miles and top off the fluid (saved me a $600 towing bill). Actually, since I didn't go over 55, I only lost about 1/2 a pint of fluid. NOTE, I AM NOT RECOMMENDING THIS TO ANYONE. NO GUARANTEES EXPRESSED OR IMPLIED.

Thanks!

 

[K5Jimmy]

Cheap and easy to rebuild what ya got...

Bearing/seal kit, Chain, prolly a range fork...$250

take the tailhousing off and see if you broke a C Clip....it lets the shaft wander and is a common break....I got my first one from a dealer for like $8 which really pizzed me off.....Then I just rebuilt the whole thing...easy to do and that way ya know what ya got...

 

[AZ_Overdrive]

Thanks for the info. Where is the best place to get the parts?

Also wanted to know about the 1ton vs Burb 241 internals since I was planning on swapping out the trans to a 400 and wanted to use the input shaft from the 1T on my Burb case (28 to 32 spline change for the 400).

 

[sled_dog]

Internals are the same. Only difference is the 32 spline input vs the 27 spline input on the Burb.

 

[u2slow]

The input shafts will swap if they are indeed both NP241s.

My only concern is if that 1-ton donor is a dually truck, its a BW1370 instead.

 

[AZ_Overdrive]

Yes, it is a dulley.

What is a BW1370 ????

Need to make my $$$ decision first thing in the morning so any quick responses are appreciated!


Thanks!

 

[AZ_Overdrive]

OK, did a quick web search. Looks like the BW1370 is a transfer case used on the trucks (89 1 ton). Hmmmm. Never herd of it but you learn something new every day.

So here are a couple of VERY important questions:

1. Will the adapter from the 400 to the BW1470 work with my NP241?

2. Are the input shafts compatable between the BW1370 and the NP241?

I will crawl up under the truck tomorrow to verify the tag on the tcase.

My two big concerns are:

1. Will the trans/tcase adapter work with my 89 burb swapping the 1 ton's 400 and my 241.

2. How difficult is it and costly, to find a replacement 32 spline input shaft for my 241.

Thanks for any info!

 

[u2slow]

1. Will the trans/tcase adapter work...

Yes. Its the same adapter for both cases.

2. Are the input shafts compatable...

I don't know. Odds are against... being different manufacturers. (New Process/Venture vs. Borg-Warner)

2. How difficult is it and costly, to find a replacement 32 spline input shaft for my 241.

Should be easy. NP243 (electric shift) uses the same input. NP208 might possibly work too (I have heard this, not proven it). Needs to be from a manual trans, TH400, or 4L80E application to have the 32-spline input. The ones from the IFS trucks are easy to find... you, uh... 'lucked out' and found the rare BW one.

 

[AZ_Overdrive]

Thanks for the info! Yes, my "luck" is consistent that way.

I will go crawl under the truck at lunch today and make my final decision.

BTW, I see that the wiring harness for my 89' 350 goes through the firewall on the passenger side in a farily good sized bundle. Does it "disconnect" from the firewall or what? I need to get the harness and computer from the 1 ton doner and want to be sure I get everything I need to swap the 454 in my 89.

Thanks,