4l80e swap - transfer case question

[jeffg]

I am picking up my 4l80e transmission today and I noticed that it still has the HD transfer case bolted to it. The seller wants an extra $300 for the HD transfer case. Is it worth it to keep the HD transfercase, or should I use the original tahoe transfer case and swap the input shaft? The tahoe has Autotrac, but I dont know if the 2500HD that the transfer case is from did or not.

If I use the HD transfer case, can I just swap the motors/electroncs and make it plug and play?

 

[swathdiver]

I am picking up my 4l80e transmission today and I noticed that it still has the HD transfer case bolted to it. The seller wants an extra $300 for the HD transfer case. Is it worth it to keep the HD transfercase, or should I use the original tahoe transfer case and swap the input shaft? The tahoe has Autotrac, but I dont know if the 2500HD that the transfer case is from did or not.

If I use the HD transfer case, can I just swap the motors/electroncs and make it plug and play?

@randeez

Randy, would it be easier to use the donor or swap parts into the existing one?

 

[randeez]

swapping the input would prob be a the easiest to keep everything else working, not sure if a 3/4ton came with an equivalent autotrac. and may need driveshaft shortened

 

[rockola1971]

What model is the Tcase in the 2500HD?

 

[jeffg]

Look like the new TCase is an NP263HD. Looks like its probably a no go. I guess I will just order a new input shaft and throw this one back on marketplace.

 

[rockola1971]

Look like the new TCase is an NP263HD. Looks like its probably a no go. I guess I will just order a new input shaft and throw this one back on marketplace.

While you are changing the 246 input shaft, you might want to address the pump rub problem with plate fix and dont be surprised that the chain needs replaced too. Me personally...If im opening up its getting new seals, bearings and likely atleast a chain along with the pump rub fix plate.

 

[jeffg]

While you are changing the 246 input shaft, you might want to address the pump rub problem with plate fix and dont be surprised that the chain needs replaced too. Me personally...If im opening up its getting new seals, bearings and likely atleast a chain along with the pump rub fix plate.

Thanks, I will keep that mind.

 

[rockola1971]

Thanks, I will keep that mind.

You get it open and have any questions, feel to drop a post. Tcase **** pics are welcomed. Especially carnage! There are many of us here that are Tcase self proclaimed Masters of the Universe.

 

[jeffg]

Is there a good shop that sells a conversion kit for the 246? input shaft, bearings, seals, etc? It looks like Merchant has some good parts for the pump rub problem.

 

[rockola1971]

Transfer Case Repair Parts Online - NP246 Bearing Kit

Shop For Shop For NP246 Transfer Case Bearing Kit. - Allstate Gear Is A Great Source For All Your New Process Transfer Case Parts Requirements. Call Us Today!

www.allstategear.com

Transfer Case Chain HV072 - NP149 Transfer Case Replacement Part

Buy Transfer Case Chain HV072 - Shop MORSE TEC HY-VO Transfer Case Chains at Wholesale Pricing.

www.allstategear.com

Transfer Case Repair Parts Online - NP246 Gasket & Seal Kit

Shop For NP246 Transfer Case Gasket & Seal Kit. - Allstate Gear Is A Great Source For All Your New Process Transfer Case Parts Requirements. Call Us Today!

www.allstategear.com

Amazon.com

Dont forget to inspect your rear case halve for the infamous pump rub hole. If it has already started, junk the rear case halve and get a new rear case halve or maybe a salvage one. If your vehicle has the Auto 4wd option then you will need to buy 2qts of the blue fluid (which is NOT pure tranny fluid).

You will need a pair of extended reach internal/external snapring pliers to remove the various snaprings. Bearing and seal drivers are a big help but can be replaced with ingenuity.

Stick your bearings in the freezer the night before the big day of reassembly.

 

[jeffg]

Wow! tons of help. Thank you. I really didnt think I was going to have do all of this 4l80e stuff, but my tuner said I would probably regret not doing it now while everything is apart. He doesnt think my mildly built 4l60 would survive for long.

 

[rockola1971]

Wow! tons of help. Thank you. I really didnt think I was going to have do all of this 4l80e stuff, but my tuner said I would probably regret not doing it now while everything is apart. He doesnt think my mildly built 4l60 would survive for long.

4L60E Survive behind what?

 

[jeffg]

The new engine package is:
LQ9 with forged internals 10:1 CR
BTR cam, valve springs, SS valves
Ported and Polished heads
Manguson TVS2300 @ 6 or 8 psi.

efans, electric water pump, some other odds and ends.

 

[rockola1971]

The new engine package is:
LQ9 with forged internals 10:1 CR
BTR cam, valve springs, SS valves
Ported and Polished heads
Manguson TVS2300 @ 6 or 8 psi.

efans, electric water pump, some other odds and ends.

Yeah I think it would be wise to stick a 4L80E behind all that. A mildly built 4L60E aint gonna last a fruitful life behind that LQ9 with goodies.

 

[Sam Harris]

The new engine package is:
LQ9 with forged internals 10:1 CR
BTR cam, valve springs, SS valves
Ported and Polished heads
Manguson TVS2300 @ 6 or 8 psi.

efans, electric water pump, some other odds and ends.

Ahem.. pardon me, but pics or STFU.

That is all.

 

[Erickk120]

The new engine package is:
LQ9 with forged internals 10:1 CR
BTR cam, valve springs, SS valves
Ported and Polished heads
Manguson TVS2300 @ 6 or 8 psi.

efans, electric water pump, some other odds and ends.

I'm jealous! If you want to, you can upgrade the stock 3-4 pinion planet from the 246 to a 6 pinion planet, just for the hell of it, can be found under $100
As far as the pump anything even the spacer/shim design will do it, but I'm biased towards the merchant fix, as its fused as an assembly with the pump.

 

[jeffg]

Ahem.. pardon me, but pics or STFU.

That is all.

Is there a build section somewhere? I wouldnt mind posting progress pics.

 

[Sam Harris]

Is there a build section somewhere? I wouldnt mind posting progress pics.

Under Construction

Post photos of your projects coming together. Build-up threads only!

www.tahoeyukonforum.com

I’m supposed to be doing one of these myself… so I suppose I can’t really b i t c h at you.. however, I’m pretty tied up at the moment..

 

[jeffg]

Under Construction thread started.