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#1 |
Registered User
Join Date: Sep 2017
Location: Patriot IN
Posts: 163
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Manual transmission thoughts for HD car hauler.
I am in need of a new transmission for my 70 C30 it was a wedge truck that has been stretched into a dovetail truck with a 17ft bed. I believe the current transmission is the SM465 and it needs completely rebuilt or replaced. I would like to replace the transmission. My first thought was to replace it with a NV4500. However I am worried about the 5th gear issue. I know there are upgrades and supposed fixes. I have no problem not being able to use 5th gear when it's loaded up my main concern is, is it too heavy as is unloaded? I want to be able to use 5th gear unloaded. The way I see it, it is about as heavy as towing an empty HD trailer as it is. Or am I putting too much thought into it? Is there a better alternative for a transmission upgrade? I want to keep it a manual. That said it still has the original 350 engine in it and it this time I don't plan on swapping it out. Though I have had the thought of throwing on a 671 blower on it, but only time will tell what I end up doing with it. So do you all think I will have any problems with the NV4500 unloaded? I plan on doing the fixes to it. if that makes a difference.
The truck. [IMG] ![]() [IMG] ![]() |
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#2 |
Registered User
Join Date: Jun 2013
Location: West Virginia
Posts: 6,421
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Re: Manual transmission thoughts for HD car hauler.
I cannot help you but I wish to commend your decision to keep the manual transmission. I wish more drivers liked stick like I do.
TTT |
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#3 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,156
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Re: Manual transmission thoughts for HD car hauler.
Here is a link that may help you with your decision. Another option is a gear splinter like the Ranger from Advance Adapters. Let us know what you decide on.
https://www.novak-adapt.com/knowledg...ssions/manual/
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#4 |
Registered User
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
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Re: Manual transmission thoughts for HD car hauler.
You should do fine with the NV4500, the 5th gear issue is mainly with diesel trucks. There is some good reading on Quad4x4.com covering the problem & various fixes / attempted fixes.
One other option is to keep the 465 & install a Ranger gear splitter. It's basically an overdrive that fits between the trans & the bell housing but it allows you to shift into overdrive in any gear. Advance Adapters makes/sells them. 3rd option, there was an overdrive 5 speed available in the medium duty trucks that will bolt in. I can't remember the name/number, I'm sure someone here does. The problem is they are hard to find. (HO455 beat me to it!) |
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#5 | |||
Registered User
Join Date: Sep 2017
Location: Patriot IN
Posts: 163
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Re: Manual transmission thoughts for HD car hauler.
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That said it looks like I am going to pick one up tomorrow afternoon. It comes with the bell housing, master cylinder, slave, flywheel, pressure plate, and clutch disc. I will definitely be upgrading the clutch. The transmission is a 95 I assume the flywheel will not fit the older 350? I have not decided if I want to convert it to the hydraulic clutch or not. |
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#6 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,515
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Re: Manual transmission thoughts for HD car hauler.
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Here is how I replaced the SM465 in my '72 C-30 with the Chevy NV4500 on the cheap. I pull my H&H 20' tilt bed trailer with it regularly. I have hauled '99 Camaro's to '39 "A" John Deere tractors and use the OD on all but the steepest hills. http://67-72chevytrucks.com/vboard/s...d.php?t=673588 LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#7 |
Registered User
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
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Re: Manual transmission thoughts for HD car hauler.
No, it not the NV3500, that's too new & lighter duty than the 4500. the 5 speed I'm talking about was produced the same time as our trucks (60's & 70's) I believe it was a Clark? Not sure, came in the C-60's.
You will like your 4500 when you get it in! You're right, the 95 flywheel wont fit your engine (1 piece vs 2 piece rear main seal) |
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#8 |
Registered User
Join Date: Dec 2009
Location: bisbee, arizona
Posts: 1,529
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Re: Manual transmission thoughts for HD car hauler.
x2 0n the 4500
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#9 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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I have the 67 ramp truck with 4 speed. I'm planning on a auto when I swap it out. I want a 4l80E are something to that effect. The 4 speed is fine but I just like the auto's.
Nice ramp by the way sir! ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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