09-17-2015, 09:06 PM | #1 |
Registered User
Join Date: Sep 2015
Location: Haughton LA
Posts: 75
|
Standard transmission
Guys, I have a 71 4X4 with the super low 1st, and three more.... I was wondering is a 5 speed out of a, say 89 4X4, bolt right in? Of course I have a manual clutch, and the newer tranny's have a hydrolic clutch, so will the manual work? Thanks guys....
|
09-17-2015, 09:21 PM | #2 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,727
|
Re: Standard transmission
The NV4500 is neither an easy nor an inexpensive swap. The SM465 that your truck has really works in a wide range of circumstances. It's best to gear your truck to the 1:1 4th gear to get the rpm you want on the highway and take advantage of the low gear when you need it offroad. Even with 3.07 gears, the low range first gear in an SM465/NP205 truck is 39:1.
Compare that to the T150 in my 70 CJ5 where 3.54 gears a 2.97 first and 2:1 in the Dana 20 is only 21:1 low gear. FWIW, except when needing to go super slow, get started with a trailer, etc. no need to use first. And the 3.5:1 second gear of the SM465 is WAY better than the jeeps stupidly geared 3 speed.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
09-17-2015, 09:43 PM | #3 |
Registered User
Join Date: Sep 2015
Location: Haughton LA
Posts: 75
|
Re: Standard transmission
I don't use the first gear, pointless to even try.... I haven't had the truck for very long, the few times I have driven it, I start topping out in the low 70's, not really trying to do 120, just would like to cruise comfortable at 75.... Can a guy purchase gears for this particular tranny to make it more highway friendly?
|
09-17-2015, 10:06 PM | #4 | |
Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,628
|
Re: Standard transmission
Quote:
|
|
09-18-2015, 07:05 AM | #5 |
Registered User
Join Date: Sep 2015
Location: Haughton LA
Posts: 75
|
Re: Standard transmission
I will be putting on taller tires, what's on there now is some street tires.... I don't know what gears are in it yet, I'm assuming the 3.73, they put them in everything.... I had the same tires on my 72 Blazer with turbo 350, and 3.73 gears, and it flew down the highway.... Thanks for all the info guys, it gives me something to think about....
|
09-18-2015, 07:40 AM | #6 |
Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
|
Re: Standard transmission
Is your '71 a K/10 or K/20? If K/10 3.73s are possible. I used to go round and round on overdrive, cost, labor, gears good for off road as well as off road. I finally arrived at just driving 65 and liking it. It's an old truck and it likes it, too. I don't feel I'm running behind with the rest of the world. 65 is getting on down the road just fine. Overdrive is meant to slow the drivetrain down to reduced wear and tear as well as increase fuel economy. But the mass of people are mindless and are just driving faster. I'm not one of them. I just let them fly on by while I enjoy driving a cool old truck
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
09-18-2015, 08:21 AM | #7 |
Registered User
Join Date: Jul 2009
Location: Milwaukee, WI
Posts: 575
|
Re: Standard transmission
My 68 K10 SWB has 3.73 gearing and the 4 speed and 33's. It will be interesting to see how she does on the highway once I get it road worthy.
Last edited by Dave K.; 09-18-2015 at 08:39 AM. |
09-18-2015, 01:49 PM | #8 |
Registered User
Join Date: Jun 2002
Location: Tucson AZ by way of WI & CA
Posts: 510
|
Re: Standard transmission
So here is some numbers to consider. For every inch in diameter your tire grows you gain 2 mph at a given rpm. For every inch your tire grows you reduce your rpm by 100 at a given speed. An overdrive transmission will reduce your rpm by 600. Changing rear gears to 3.42 drops rpm by 250, and 3.08 by another 250. Assuming these are available for your axle. Estimate gears to cost 1k per axle, or tires 1k per vehicle, or transmission 2k per vehicle, best bet is to go the tire route. Might be a dog off the line, but you have the granny gear, but you gain on the high side. Also with the gear ratio of the SM465, this may give you more range in 2 and 3rd. So @ 2500 rpm the max speed in 1st is 9, 2nd is 16, 3rd is 35, and 1st is 55. With 6" (34") taller tires @ 2500 rpm the max speed in 1st is 11, 2nd is 19, 3rd is 43, and 1st is 67. Just my 2 cents
Last edited by my67c20; 09-18-2015 at 02:05 PM. |
09-18-2015, 05:33 PM | #9 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
|
Re: Standard transmission
Has anyone tried a 4x4 NV3500 swap? It's not my favorite trans but it should be plentiful and cheap.
__________________
My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
09-18-2015, 11:00 PM | #10 |
All about them K’s
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,487
|
Re: Standard transmission
I'd be kinda weary of the 3500. These trucks are a bit heavier than an S/10
__________________
Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s |
09-19-2015, 12:25 PM | #11 |
Registered User
Join Date: Aug 2015
Location: Starbase 4
Posts: 118
|
Re: Standard transmission
The NV3500 works fine in the 99-06 trucks, behind the V6 and the 4.8, and those trucks are full-size and way heavier than a S-10.
They were also used in full-size Dodge trucks and many jeeps (not exactly a ringing endorsement, but...) |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|