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Posted by Paul ( in NY) on Monday, June 16, 2008 at 13:22:58 :
In Reply to: Wasn't That Fixed By 2001? posted by Marty on Monday, June 16, 2008 at 12:11:38 :
Back in 2003, I contacted Customer Support at New Venture Gear asking for information on the 5th gear nut issue. The following is a cut and paste of the email I received. I have never had a problem with my NV-4500's. However, NV-4500's dont like running at less than 1600 RPM's in 5th gear. From what I have read, it appears that lower RPM's in 5th can force a problem.
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From: "John Malone"
Sent: January 2, 2003
Subject: NV 4500 Mandatory Repair
Paul;
The NV 4500 Transmission as used in General Motors, Chevy and Dodge Trucks form its introduction to 1995 suffer a design problem in the 5th gear lock nut retainer. It is probable that during the life of the NV 4500 Transmission, the 5th gear retainer nut will loosen and allow the final 5th Overdrive Gear to fall off the shaft. When this happens SERIOUS damage will happen to the Overdrive. The more miles the transmission has, the more apt the fail to occur.
The update to eliminate this problem is a new 5th gear Nut with a newly designed retainer. The retro fit requires special tools and can not be done properly without the special tools. All Authorized New Venture Transmission stations can make the retro fit. The cost which includes a modification to the output shaft is $250.00, Two Hundred Fifty Dollars.
All transmissions modified by New Venture Transmissions will have the words "NEW NUT" stamped into the case by the top left Overdrive mounting bolt. If these words are not there, consider the transmission as unmodified and a serious threat of failure. Transmissions built after January 1st, 1999 feature a completely new 5th gear retention system eliminating the 5th gear nut problem.
I hope this answers your question on the 5th gear nut failures.
Sincerely
John Malone
NV 4500 Customer Support
New Venture Transmissions
Syracuse, NY
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