85 SM465 Transmission swap question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Edahall · 06-01-2014, 08:16 AM

I believe not towing in 5th gear with the NV4500 was related to extremely high torque engines like the Cummmins 6BT. Towing in O/D would cause the 5th gear nut to back out resulting in loss of that gear. There are fixes for this issue but it may be a non issue behind a 350.

Desert1957 · 06-01-2014, 08:19 AM

Quote:

Originally Posted by Edahall

I believe not towing in 5th gear with the NV4500 was related to extremely high torque engines like the Cummmins 6BT. Towing in O/D would cause the 5th gear nut to back out resulting in loss of that gear. There are fixes for this issue but it may be a non issue behind a 350.

Thanks

MalibuSSwagon · 06-01-2014, 09:42 AM

There is also the Ranger Overdrive option for guys that tow and like shifting....I was considering this option versus the NV4500.

06-01-2014, 08:16 AM	#1
Edahall Registered User Join Date: May 2011 Location: Goliad, TX Posts: 672	Re: 85 SM465 Transmission swap question I believe not towing in 5th gear with the NV4500 was related to extremely high torque engines like the Cummmins 6BT. Towing in O/D would cause the 5th gear nut to back out resulting in loss of that gear. There are fixes for this issue but it may be a non issue behind a 350. __________________ 1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift

06-01-2014, 09:42 AM	#3
MalibuSSwagon Registered User Join Date: Sep 2009 Location: Weare,NH Posts: 1,592	Re: 85 SM465 Transmission swap question There is also the Ranger Overdrive option for guys that tow and like shifting....I was considering this option versus the NV4500. __________________ Eric 1992 Oldsmobile Custom Cruiser 1986 Chevrolet C10\|5.3L\|TKO600\|Shortbed\|Custom Deluxe 1983 Malibu Wagon\|TPI 305\|T5 5 speed\|3.73 non-posi



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