4x4 manual transmission options - The 1947 - Present Chevrolet & GMC Truck Message Board Network

FriskyFleabag · 02-06-2018, 09:02 PM

What are some of the options for a manual transmission for my 72 K10? The truck currently has a th350 in it. I would prefer an overdrive trans but not a deal breaker. I have 35's on it and plan to take it off-road here and there.

Thanks

**71blksuper4x4** · 02-06-2018, 09:56 PM

Nv4500 for overdrive or the sm465 which could have came stock in these which is a 4spd.

**kwmech** · 02-06-2018, 10:09 PM

Keeping the stock gearing with the 35s may not need an overdrive

FriskyFleabag · 02-06-2018, 10:09 PM

Quote:

Originally Posted by 71blksuper4x4

Nv4500 for overdrive or the sm465 which could have came stock in these which is a 4spd.

Thank you! For the sm465 are there differences between a 2wd or 4wd trans? Would I need an adapter to bolt up to my np205?

57taskforce · 02-06-2018, 10:22 PM

Quote:

Originally Posted by kwmech

Keeping the stock gearing with the 35s may not need an overdrive

Exactly what I was gonna say. All of the following is assuming you’ve got a stock drive train with th350 and np 205 transfer case.
The transfer case it’s self is the same in that it is a small input bearing case(non turbo 400, 85+sm465) the input shaft on the np205 will have to be changed out to a coarse 10 spline Input and you’ll need a 4x4 sm465, the 465 to 205 adaptor, and the 10 spline collar to join the transmission main shaft to the 205 input shaft. You’ll also have to make sure you gather the correct years parts for the case you have. From 69-84(?)ish (don’t remember 100% the cut off year) the 205 cases use a race track type adaptor mount pattern 85(?)-91 use the round pattern 205 and a different sm465 main shaft and 205 input shaft. So in a nutshell 84 ish down 4x4 465 with adaptor and corresponding 205 input shaft and 10 spline collar is what you’d need. Clear as mud right?
If it were me I’d try to find the trans and transfer case together from the same truck. Takes the guess work out of it if your not sure what exactly is needed.
Edti: however you can buy everything from http://www.offroaddesign.com/catalog.htm to make your th350 205 case work with a 4x4 84 down 465.

FriskyFleabag · 02-07-2018, 11:51 AM

Thanks guys I appreciate the help.

**HO455** · 02-07-2018, 01:48 PM

Sounds like 57taskforce has gone down the road your contemplating and that should make it easier for you. But just in case your like me and are interested in more knowledge here is a link to Novak's tranny pages to give you a good comparison of trannys. Plus they are good people to work with.

https://www.novak-adapt.com/knowledg...ssions/manual/

Bigdav160 · 02-07-2018, 01:56 PM

I would think with 35" tires you want to change axle ratios. Wasn't a 3.07 standard with V8-auto?

Do you know what final drive ratio you have?

FriskyFleabag · 02-07-2018, 02:21 PM

Quote:

Originally Posted by Bigdav160

I would think with 35" tires you want to change axle ratios. Wasn't a 3.07 standard with V8-auto?

Do you know what final drive ratio you have?

No clue yet. I just got the truck last week. The trans has no reverse or third. Haven't had a lot of time to mess with it.

**WorkinLonghorn** · 02-07-2018, 02:50 PM

NP 435 Close Ratio is a very nice 4 Spd. (see it on the link above posted by HO455). The SM 465 is good for getting a large trailer moving on a hill with that deep 1st gear, but I prefer my NP435's ratios and it shifts with a short throw and very smoothly.
Ratios are; 1st...4.56, 2nd...2.28, 3d...1.31, 4th...1-1 direct. -BA

cleszkie · 02-07-2018, 03:10 PM

The TH350 auto trans you have now means you most likely have the 3.08 highway gearing in your axles. If you are running 35" tires, a 4.10 ratio is perfect without overdrive, unless you want to cruise at 75+ mph. I ran the SM465/NP205 combo with 35" tires for years with 4.10 gearing and was very happy. I do tow loaded car trailers and my 27' boat, so the extra low first gear is great for getting moving on hills. I since found a Gear Vendors overdrive unit in a junk yard and bolted it to the back of the NP205, so now I can split gears and cruise at high speeds. But having the overdrive is not necessary, more of a luxury.

FriskyFleabag · 02-09-2018, 08:48 PM

I found this trans locally. Does this look like an sm465? Guy dosent know much about it. He does have the bell housing as well. I just don't know very much about these old transmissions.

57taskforce · 02-09-2018, 09:00 PM

Yes that is a 465/205

FriskyFleabag · 02-09-2018, 09:02 PM

Quote:

Originally Posted by 57taskforce

Yes that is a 465/205

Awesome, thank you! I'll go pick it up tomorrow

02-06-2018, 09:02 PM	#1
FriskyFleabag Registered User Join Date: Feb 2018 Location: Jacksonville FL Posts: 18	4x4 manual transmission options What are some of the options for a manual transmission for my 72 K10? The truck currently has a th350 in it. I would prefer an overdrive trans but not a deal breaker. I have 35's on it and plan to take it off-road here and there. Thanks

02-06-2018, 09:56 PM	#2
71blksuper4x4 SWB 4x4 Collector Join Date: Jun 2001 Location: Osage City, KS Posts: 5,155	Re: 4x4 manual transmission options Nv4500 for overdrive or the sm465 which could have came stock in these which is a 4spd. __________________ TREVOR 1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks) 1972 Jimmy (soon to be Hickey cloned) 1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track) 1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank 1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT) http://67-72chevytrucks.com/vboard/s...d.php?t=624819 1989 V3500 Crew Cab (454tbi, NV4500, np205) 1970 Chevelle SS (LS5 454,th400,8track,buckets,tach) :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever

02-06-2018, 10:09 PM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,595	Re: 4x4 manual transmission options Keeping the stock gearing with the 35s may not need an overdrive

02-07-2018, 11:51 AM	#6
FriskyFleabag Registered User Join Date: Feb 2018 Location: Jacksonville FL Posts: 18	Re: 4x4 manual transmission options Thanks guys I appreciate the help.

02-07-2018, 01:48 PM	#7
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,275	Re: 4x4 manual transmission options Sounds like 57taskforce has gone down the road your contemplating and that should make it easier for you. But just in case your like me and are interested in more knowledge here is a link to Novak's tranny pages to give you a good comparison of trannys. Plus they are good people to work with. 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

02-07-2018, 01:56 PM	#8
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: 4x4 manual transmission options I would think with 35" tires you want to change axle ratios. Wasn't a 3.07 standard with V8-auto? Do you know what final drive ratio you have? __________________ 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

02-07-2018, 02:50 PM	#10
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,883	Re: 4x4 manual transmission options NP 435 Close Ratio is a very nice 4 Spd. (see it on the link above posted by HO455). The SM 465 is good for getting a large trailer moving on a hill with that deep 1st gear, but I prefer my NP435's ratios and it shifts with a short throw and very smoothly. Ratios are; 1st...4.56, 2nd...2.28, 3d...1.31, 4th...1-1 direct. -BA __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

02-07-2018, 03:10 PM	#11
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: 4x4 manual transmission options The TH350 auto trans you have now means you most likely have the 3.08 highway gearing in your axles. If you are running 35" tires, a 4.10 ratio is perfect without overdrive, unless you want to cruise at 75+ mph. I ran the SM465/NP205 combo with 35" tires for years with 4.10 gearing and was very happy. I do tow loaded car trailers and my 27' boat, so the extra low first gear is great for getting moving on hills. I since found a Gear Vendors overdrive unit in a junk yard and bolted it to the back of the NP205, so now I can split gears and cruise at high speeds. But having the overdrive is not necessary, more of a luxury.

02-09-2018, 08:48 PM	#12
FriskyFleabag Registered User Join Date: Feb 2018 Location: Jacksonville FL Posts: 18	Re: 4x4 manual transmission options I found this trans locally. Does this look like an sm465? Guy dosent know much about it. He does have the bell housing as well. I just don't know very much about these old transmissions. Attached Images

02-09-2018, 09:00 PM	#13
57taskforce All about them K’s Join Date: Jun 2014 Location: Land of Entrapment Posts: 6,444	Re: 4x4 manual transmission options Yes that is a 465/205 __________________ 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



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