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Old 03-03-2018, 10:19 PM   #1
todds66
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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.
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Old 03-03-2018, 10:48 PM   #2
kwmech
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Re: 1968 manual transmission

With the 6 cyl I'd go with the NV3500
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Old 03-03-2018, 11:29 PM   #3
todds66
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Re: 1968 manual transmission

Thanks. I will research them now
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Old 03-04-2018, 02:02 AM   #4
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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/
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Old 03-04-2018, 08:43 PM   #5
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Re: 1968 manual transmission

-
This thread covers just about everything....

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

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Old 03-04-2018, 09:25 PM   #6
'68OrangeSunshine
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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.
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Every 25 years I like to rebuild that 292, whether it needs it or not.
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Old 03-04-2018, 11:17 PM   #7
todds66
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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.
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Old 03-10-2018, 09:48 PM   #8
'68OrangeSunshine
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Re: 1968 manual transmission

Quote:
Originally Posted by todds66 View Post
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
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Old 03-11-2018, 10:37 PM   #9
schwoch1
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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
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Old 03-12-2018, 10:28 AM   #10
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Re: 1968 manual transmission

Quote:
Originally Posted by schwoch1 View Post
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.

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Old 03-12-2018, 11:58 AM   #11
schwoch1
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Re: 1968 manual transmission

Quote:
Originally Posted by LockDoc View Post
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
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