1968 manual transmission - The 1947 - Present Chevrolet & GMC Truck Message Board Network

todds66 · 03-03-2018, 10:19 PM

I have a stock 4 speed manual transmission and was hoping someone could tell me which 4 or 5 speed would be the best and easiest to swap with this one. We have an inline 6 cylinder 292 motor.

**kwmech** · 03-03-2018, 10:48 PM

With the 6 cyl I'd go with the NV3500

todds66 · 03-03-2018, 11:29 PM

Thanks. I will research them now

**HO455** · 03-04-2018, 02:02 AM

Here is a link to Novak's web site. Click in the manual tranny section to compare tranny's.

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

**LockDoc** · 03-04-2018, 08:43 PM

-
This thread covers just about everything....

http://67-72chevytrucks.com/vboard/s...d.php?t=438224

LockDoc

**'68OrangeSunshine** · 03-04-2018, 09:25 PM

Stock vintage set up w/ 292 L6 would be SM465. M-Y '68 was first year for 465. That's the granny gear-2-3-4 four-on-the-floor, cast iron case. Ultra reliable and bombproof.

todds66 · 03-04-2018, 11:17 PM

68OrangeSunshine, yes it has a granny 1st gear, 2,3,4. We are looking for something more efficient to put in.

**'68OrangeSunshine** · 03-10-2018, 09:48 PM

Quote:

Originally Posted by todds66

68OrangeSunshine, yes it has a granny 1st gear, 2,3,4. We are looking for something more efficient to put in.

If I could get one I'd use the New Process A833 [RPO MY6 or MM7 - 4x4]. Originally a Mopar beefy 4-speed [like the SM465] in cast iron, it got reworked with the granny gear eliminated, and 2-3-4 became 1-2-3 and 4th became a 0.73 OD, all in an aluminum case. Not rated for high horsepower or heavy torque applications.
Chevy used them in the '80s, ending with the '87 MY in trucks and Blazers. There's an 11 page thread about the NP A833:
http://www.67-72chevytrucks.com/vboa...d.php?t=670789

**schwoch1** · 03-11-2018, 10:37 PM

Look into the AX15 5 speed trans also. Novak makes an adapter to put them behind a standard GM pattern bellhousing. I am installing the newer version of the AX15, called the AR5 in my '67 GMC with a V6. Novak's adapter works on that trans also! Sourced the trans from a 2009 Colorado 4 banger truck. The Jeep guys beat the snot out of these transmissions and have few issues!

Mike

**LockDoc** · 03-12-2018, 10:28 AM

Quote:

Originally Posted by schwoch1

Look into the AX15 5 speed trans also. Novak makes an adapter to put them behind a standard GM pattern bellhousing. I am installing the newer version of the AX15, called the AR5 in my '67 GMC with a V6. Novak's adapter works on that trans also! Sourced the trans from a 2009 Colorado 4 banger truck. The Jeep guys beat the snot out of these transmissions and have few issues!

Mike

The Jeep AX15 or the Toyota Supra Turbo R154 5 speeds.(basically the same trans) The adapter is a little pricey but it is milled, and the kit comes with a GM front bearing retainer/throwout sleeve and mounting hardware. I have the AX15 in my '34 Ford Coupe behind a Chevy 377 stroker motor. I haven't driven it much yet but it seems pretty smooth.

LockDoc

**schwoch1** · 03-12-2018, 11:58 AM

Quote:

Originally Posted by LockDoc

The Jeep AX15 or the Toyota Supra Turbo R154 5 speeds.(basically the same trans) The adapter is a little pricey but it is milled, and the kit comes with a GM front bearing retainer/throwout sleeve and mounting hardware. I have the AX15 in my '34 Ford Coupe behind a Chevy 377 stroker motor. I haven't driven it much yet but it seems pretty smooth.

LockDoc

Yep, adapter was $320 shipped to me. I was able to get the transmission for $150. in the end after a can of paint for the transmission I got about $500 into it. The only pisser is the newer Colorado transmission has a 26 spline input, and no one makes a 12" clutch in that size. In my application an 11" clutch will be just fine for me.

Mike

03-03-2018, 10:19 PM	#1
todds66 Registered User Join Date: Jul 2015 Location: Brentwood, CA Posts: 46	1968 manual transmission I have a stock 4 speed manual transmission and was hoping someone could tell me which 4 or 5 speed would be the best and easiest to swap with this one. We have an inline 6 cylinder 292 motor. __________________ 1966 Custom Cab SWB SBW Fleetside 1968 C10 BBW SWB Fleetside

03-03-2018, 10:48 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,628	Re: 1968 manual transmission With the 6 cyl I'd go with the NV3500

03-03-2018, 11:29 PM	#3
todds66 Registered User Join Date: Jul 2015 Location: Brentwood, CA Posts: 46	Re: 1968 manual transmission Thanks. I will research them now __________________ 1966 Custom Cab SWB SBW Fleetside 1968 C10 BBW SWB Fleetside

03-04-2018, 02:02 AM	#4
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,350	Re: 1968 manual transmission Here is a link to Novak's web site. Click in the manual tranny section to compare tranny's. 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

03-04-2018, 08:43 PM	#5
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,771	Re: 1968 manual transmission - This thread covers just about everything.... http://67-72chevytrucks.com/vboard/s...d.php?t=438224 LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

03-04-2018, 09:25 PM	#6
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Re: 1968 manual transmission Stock vintage set up w/ 292 L6 would be SM465. M-Y '68 was first year for 465. That's the granny gear-2-3-4 four-on-the-floor, cast iron case. Ultra reliable and bombproof. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

03-04-2018, 11:17 PM	#7
todds66 Registered User Join Date: Jul 2015 Location: Brentwood, CA Posts: 46	Re: 1968 manual transmission 68OrangeSunshine, yes it has a granny 1st gear, 2,3,4. We are looking for something more efficient to put in. __________________ 1966 Custom Cab SWB SBW Fleetside 1968 C10 BBW SWB Fleetside

03-11-2018, 10:37 PM	#9
schwoch1 Local Detroit diesel nut! Join Date: Apr 2008 Location: Burlington, WI Posts: 175	Re: 1968 manual transmission Look into the AX15 5 speed trans also. Novak makes an adapter to put them behind a standard GM pattern bellhousing. I am installing the newer version of the AX15, called the AR5 in my '67 GMC with a V6. Novak's adapter works on that trans also! Sourced the trans from a 2009 Colorado 4 banger truck. The Jeep guys beat the snot out of these transmissions and have few issues! Mike __________________ Nothing cool anymore, I am old and boring....



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