NV4500 5th Gear Retainer - Dodge Cummins Diesel Forum
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post #1 of 9 (permalink) Old 01-14-2020, 01:20 PM Thread Starter
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NV4500 5th Gear Retainer

Does the 4 pronged 5th gear nut retainer just sit loose on the splines. Mine keeps slipping off when I move the transmission around. Don't want to install the trans only to pull it again. How do I make that little retainer stay in its slot?

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post #2 of 9 (permalink) Old 01-14-2020, 01:34 PM
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The back of the case should close enough to the retainer as not to allow the prongs to slip off the nut. Do you have the back portion of the case off still?
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post #3 of 9 (permalink) Old 01-14-2020, 01:50 PM
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That nut wont fix the issue. You need a fully splined main shaft. If 5th gear already fell off, the splines will damaged and the gear wont sit tightly and fall off again. If you have a brand new shaft (old style even) the upgraded nut will probably work then.

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post #4 of 9 (permalink) Old 01-14-2020, 02:04 PM Thread Starter
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Its never fallen off before just put it on there since the trans was out. I put a cast iron rear housing on it. Not the defective one. But I can't put the rear seal in since it will be mated to the np205. Is it the seal that holds it on? I can put a screw driver in there and wiggle the retainer.
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post #5 of 9 (permalink) Old 01-14-2020, 02:09 PM
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Does the gear itself sit tightly on the shaft or it does it have some slop.

Daily driver/ workhorse: 1994 2500SLT 4x4 Auto. Hewitt EGT, Boost, Trans gauges, Under hood Mech FP gauge, Trident fuel lines, Tork Tek OFV, Mag-Hytec DD Transmission Pan, Ford manual hub conversion, Diamond eye 4" turbo back, 37337 Upgrade. 260K

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post #6 of 9 (permalink) Old 01-14-2020, 03:18 PM Thread Starter
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Gear is tight the new nut is tight as well. Its just the little 4 prong holder thats loose
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post #7 of 9 (permalink) Old 01-14-2020, 08:32 PM
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That retainer is designed to be held in place by the transfer case input shaft. The transfer case would have been an NP241 with a female 29 spline input. Because you are running a 205 with a drive sleeve, I'm not sure the fully seated drive sleeve will properly hold that retainer in place. You're going to have to put the drive sleeve on the t-case input, pushed on as far as it will go, and measure from the t-case mounting face to the trans side of the drive sleeve. Then, measure from the face of the seated retainer to the t-case mounting flange on the trans tail housing. The first measurement should be between .001" to .010" SHORTER than the second measurement. If it is longer you will be preloading bearings when you assemble the t-case onto the trans, which is A Bad Thing™. If it's more than .010" or so you risk beating the 4 tangs off the retainer. Obviously if it's ¼" or more the retainer will just pop right off the nut.

Fixes: If the drive sleeve is too long (i.e. will preload the bearings when assembled), simply turn or grind down the trans end of the sleeve to the proper dimensions. If it is too short, then depending on how much it's too short you can fill in the gap with anything from thin shims or washers to a machined spacer.
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post #8 of 9 (permalink) Old 01-14-2020, 09:11 PM Thread Starter
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If I was mating to a np271 it wouldn't hold it either because the seal would be in place. Since im mating it to a np205 with out the seal you think the coupler will hold it in place?
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post #9 of 9 (permalink) Old 01-23-2020, 05:47 AM
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Quote:
Originally Posted by Cumstromax View Post
If I was mating to a np271 it wouldn't hold it either because the seal would be in place. Since im mating it to a np205 with out the seal you think the coupler will hold it in place?
You need to push the coupler on to the 205 input as far as it will go (it should have a snap ring in the center to prevent it from going more than half-way) and do some measurements to check. I have a retainer similar to that on my GM 4500 and I'm using a 205 as well, but the sole seal in my setup is the double-sided lip seal on the t-case input bearing retainer. Are you using a Ford 205 with a 29 spline male input?

Last edited by MaxPF; 01-23-2020 at 05:50 AM.
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