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Nv4500 to np241
I’m picking up a nv4500 out of a 02 silverado later today for my 70 k5. I have a passenger drop np241 out of a 1990 k5 to go behind it. I know I will have to make some changes since the nv4500 has 32 spline output and the np241 has 27 spline input. I’m thinking the only change is tcase input shaft, can anyone confirm I’m on the right track?
https://www.allstategear.com/NP241-I...ft-p/17118.htm |
Re: Nv4500 to np241
That's it, just the input swap. There is however a different design input bearing and I can't remember what year this took place. I don't think it anything to do with the spline input though. You may also want to get a slip yoke eliminator kit and install that while it's apart, (Highly Recommended) AND install new shift fork pads at the same time. You'll probably find when it's apart that one side of them is pretty thin or missing. ALSO get new snap rings for the gear install
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Re: Nv4500 to np241
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The slip yoke eliminator kits I’m seeing are way more than I have in the tcase. Is there a more “cost effective” route than what I’m seeing? Hack and tap? |
Re: Nv4500 to np241
Another idea for the tcase. I can get an np205 for less than the sye kit for the 241. Would that be a better route to go?
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Re: Nv4500 to np241
In less have a sh!t ton of torque, a 241 is fine. In order to run the 205 behind the 4500, need to notch the adaptor for the t-case shifter. Not hard, just one more thing that needs to be done. Plus depending what was in front of the 205, might need to change that input too....
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Re: Nv4500 to np241
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Re: Nv4500 to np241
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Sounds like an input swap and sye kit will be worth it in the 241 since I only have $100 in it as it sits in stock 27 spline form. I picked up my nv4500 yesterday (it’s out of an 02 silverado 3/4 ton). It has a sticker on the side that had a date of 3/23/2021. Did some digging and emailed Zumbrota Drivetrain, they confirmed that it is 1 of their remanufactured units from 2021. Very happy with my purchase. |
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Re: Nv4500 to np241
After inspecting my parts after work today I found that the bellhousing has a 4-5” crack. What bellhousings are compatible? Do I need an 01-07 bellhousing for it to be compatible with both sbc & LS?
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Re: Nv4500 to np241
I thought the early GM ones used the original GM bolt pattern 10.078" top and 10.394 bottom used by most GM transmissions. Later years ~96 used the Chrysler pattern.
I have an AA pdf file that says the 4x4 and 2x4 bolt patterns were different in the early years. I'm confused by this. I'd measure the bolt pattern and research things. I have a 96 NV4500 and a round pattern 205 I converted to a short input if anyone cares. I also have a 2.6 doubler to bolt between them for my K10, not that the diffs can take it. :) |
Re: Nv4500 to np241
For all that have done nv4500 swaps what trans crossmember works best? Is there 1 that will work or is there 1 that works best to modify?
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Re: Nv4500 to np241
There was a write up in here somewhere of one of the guys using a factory cast iron bell housing and making the 4500 fit it by redrilling some holes. It was a nice alternative. Either that, or purchase an Advance Adapter Bell or a good welder can fix a crack
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Re: Nv4500 to np241
I don't know a lot about the NV4500 and NP241, but I had a lot of experience with troubles in both K3500s I had with that combo, a '92 and a '95. One issue in both was the DMF flywheel, which I have three different works for that acronym to call the engineers that thought that was a good idea. Both trucks ended up needing a swap to the trouble-free tried and true solid flywheel.
In the '92, I had already replaced the NV4500 with a GM crate due to dropping 5th gear resulting in expensive internal damage. To add insult to injury, later on the rubber cushions in the Dumbass MF'r gave out. GM didn't even sell replacements, but they did sell the parts to swap back to the smarter design. Before I figured out it was the flywheel cushions I thought it was a bad input bearing and had one on hand. Got into it, found the problem, and got the parts to go solid flywheel and that required changing the input shaft and a different input bearing. I guess that is the difference in input bearings kwmech mentioned above. That is my guess. |
Re: Nv4500 to np241
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