Bellhousing bolt pattern? Manual trans? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Transmission Mods

Transmission Mods Performance Transmission Modifications

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  #1  
Old 04-07-2008, 02:44 AM
RamAirZ RamAirZ is offline
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Bellhousing bolt pattern? Manual trans?

Alrighty, did alot of searching and some people say to use a colorado bellhousing to bolt a manual trans to the I6. Is the bolt pattern different than your typical GM bellhousing? I'm going to be putting this into a 67' chevy and megasquirt so no fooling the computer to worry about or shifter placement. I have an SM420 4-spd (granny low, high crawl ratio) that I want to keep behind it. Anyone have any information on something like this? My only concern is input shaft length being too long or too short (rather have too short and get fix that).
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Old 04-08-2008, 06:32 PM
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starchief1959 starchief1959 is offline
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Our tranny is standard chevy "barn roof" bolt pattern. Not too sure about shaft lengths though, not very familiar with the SM420.

Where there's a will there's a way.
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Old 04-08-2008, 06:55 PM
RamAirZ RamAirZ is offline
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its the dumb starter that is going to give me problems, hmm. The SM420 is a granny low manual tranny, basically a muncie.
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Old 04-08-2008, 10:11 PM
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starchief1959 starchief1959 is offline
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Find your input shaft dimensions and match it to an existing GM tranny (mot any chevy bellhouing will mate up). Being that the SM420 is considered GM it shouldn't be a problem making a match. That bellhousing should work for you and enable you to use the starter matching that bellhousing with your tranny. You might have to have a custom flywheel made cause I don't know the bolt patern on the TB, nor the teeth. The only thing you have to worry about now is starter clearance in the vehicle and being a '67 shouldn't be too hard.

Here's a site that might offer you some help.

http://www.novak-adapt.com/knowledge/sm420.htm
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Old 04-09-2008, 12:00 AM
Greg55_99 Greg55_99 is offline
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The Chevy bellhousing pattern is NOT the same as the 4200, although, with a fabbed adapter plate, it CAN be made to work.

Greg
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Old 04-09-2008, 02:06 AM
RamAirZ RamAirZ is offline
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The dowel pins are the same but the pattern is off and the starter is mounted upper/middle drivers side whee as all other chevys are lower passenger. I'll figure something out
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Old 04-09-2008, 09:35 AM
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starchief1959 starchief1959 is offline
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I thought we had the 4L60E tranny. That's a standard GM tranny with same bellhousing as 700R4, TH350, TH400, etc. They changed it?!? Retarded engineers. Out fixing things that aren't broken again.

As far as your starter, a new bellhousing will move it. Or like Greg said, an adapter plate. BOPs mount on the driver side so I'm sure it could be done.

Wilcap is the best tranny adapter company out there. There's a guy here in MN call Bendtsens (sp) but he's a total rip-off.
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Old 04-09-2008, 04:53 PM
RamAirZ RamAirZ is offline
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The bellhousing is removable on the 4L60E after 98'.
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Old 04-09-2008, 05:41 PM
limequat limequat is offline
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Why not use the Colorado trans? It'll bolt up. You just need a flywheel.
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Old 04-09-2008, 06:22 PM
RamAirZ RamAirZ is offline
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Because I want to keep teh SM420 with rockwell transfer case in my truck. The colorado 5-spd wouldn't last a week in my truck lol.
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