Manual tranny swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ECU PIRATE · 11-17-2012, 08:37 PM

Finally got around to dropping in my Muncie tranny after two years of talking about it. To get the hole in the tranny mount to line up with the hole in the crossmember, I had to disconnect the motor mounts from the frame and move them back. At lest the tranny is in and the driveshaft is hooked up. Anyone run into this problem before? May need to drill new holes in the frame and engine crossmember to get everything buttoned down.

Thanks,

Mike
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Seventy · 11-17-2012, 08:48 PM

Not that there is a wrong way, if youre building it custom to your liking. Typically though, you leave the engine placement the same, and move the transmission crossmember, then shorten/lengthen the driveshaft.

Moving your motor rearward isnt a bad thing, if everything clears, you just took the less traveled route.

1985-GMC · 11-18-2012, 01:39 AM

There are usually different holes in the frame for different transmission options.

ECU PIRATE · 11-19-2012, 08:27 AM

some shots

SSC's76 · 11-19-2012, 08:44 AM

might be a stupid question not knowing all the details but this trans should bolt up exactly where a th350 did as far as crossmember placement what kinda trans did you have in it before?

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ECU PIRATE · 11-19-2012, 08:51 AM

Quote:

Originally Posted by SSC's76

might be a stupid question not knowing all the details but this trans should bolt up exactly where a th350 did as far as crossmember placement what kinda trans did you have in it before?

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There are never stupid questions. I had an Olds 260/TH200 combo in there before
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ECU PIRATE · 11-19-2012, 09:01 AM

Should be exactly 1/4" bell housing to mount difference between the TH200 (20 1/8") and the TH350 (20 3/8"). This is what I was off. My truck was originally a 6 banger with a TH350
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Seventy · 11-19-2012, 10:51 AM

Pirate, have you drilled your front crossmember already? If you only have 1/4 inch difference, that isnt going to put much distance between your old and new motor mount holes. I'd be alittle concerned with swiss cheesing it up too much.

Probably will be fine, Im just anal like that.

Also, its cool you finally got it installed. Granted I just joined, but awhile back I was searching about putting a muincie in mine, and came across your older threads.

ECU PIRATE · 11-19-2012, 11:34 AM

Quote:

Originally Posted by Seventy

Pirate, have you drilled your front crossmember already? If you only have 1/4 inch difference, that isnt going to put much distance between your old and new motor mount holes. I'd be alittle concerned with swiss cheesing it up too much.

Probably will be fine, Im just anal like that.

Also, its cool you finally got it installed. Granted I just joined, but awhile back I was searching about putting a muincie in mine, and came across your older threads.

Haven't drilled jack yet Seventy. Just trying to get some ideas. I know it is an easy fix. The bed is coming off soon so, I may just on bolt the cab and raise to to get some of the tension off the frame and square up the crossmember. Either that or replace it..........
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swb85 · 11-20-2012, 10:08 AM

Woohoo for progress! You'll be banging gears before ya know it.

68Timber · 11-20-2012, 04:29 PM

Usually folk bolt the crossmember to transmission and drill holes in the frame to bolt it in its new spot. Make sure the dist cap is good for clearance and it shouldn't matter. How much trouble was it installing the linkage and pedals? Love the vintage valve covers btw.

thesickc10 · 11-20-2012, 06:02 PM

Hey would you mind measuring how far back from the firewall you made that hole for the shifter? im doing the same thing right now but with a supert10. How you going mechanical or hydraulic clutch?

ECU PIRATE · 11-20-2012, 06:41 PM

Quote:

Originally Posted by BRUISER

Usually folk bolt the crossmember to transmission and drill holes in the frame to bolt it in its new spot. Make sure the dist cap is good for clearance and it shouldn't matter. How much trouble was it installing the linkage and pedals? Love the vintage valve covers btw.

I love that old stuff!! The newest thing on that motor are a few gaskets and the Hays clutch parts. The flywheel and tranny are vintage 1968, while the motor is an 81' 4 bolt main. I haven' t swapped the pedals or column out yet but, everything is in my garage. I will end up moving the crossmember forward the required amount or replacing it entirely.
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ECU PIRATE · 11-20-2012, 06:49 PM

Quote:

Originally Posted by thesickc10

Hey would you mind measuring how far back from the firewall you made that hole for the shifter? im doing the same thing right now but with a supert10. How you going mechanical or hydraulic clutch?

I could give you dimensions but your set up maybe different. Easier thing to do would be laying some tape down the center of the tunnel centered on the hole in your crossmember. Verify this with he center of your tranny and tranny mount. My shifter had about a 2 1/4" offset from the center point. I cut my floor 4 times and still need to trim it a little more to clear in 2nd and 4th gears. I can get some measurements for you on Thursday before I head to my folks for dinner. I am going to measure it for you from inside of the cab. Your cut out will nearly be all he way back where he hump starts to rise and about 1" from where it starts to dip to the driver's side floor. You should be alright if you can cut something about 2 1/2" to 3" square. Maybe swb85 will chime in. He has been my go to guy on this swap
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thesickc10 · 11-20-2012, 08:45 PM

cool thanks man.

ECU PIRATE · 11-22-2012, 08:53 AM

Here you go bro. I will be heading back to Easton, Pa in about a month for X-Mas
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ECU PIRATE · 11-22-2012, 08:54 AM

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ECU PIRATE · 11-22-2012, 08:55 AM

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Happy Thanksgiving to all..............
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thesickc10 · 11-22-2012, 10:06 AM

awesome thanks man! Easton is only about 45 minutes from me. Are you bringing your chevy for the holidays?

ECU PIRATE · 11-22-2012, 10:23 AM

Quote:

Originally Posted by thesickc10

awesome thanks man! Easton is only about 45 minutes from me. Are you bringing your chevy for the holidays?

Nice......the ole girl is in the garage for another winter I am sad to say. 45 minutes ain't that bad. I normally make parts run every time I am up there. Drop me an email bro: ecupirate98@cox.net

Mike
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11-17-2012, 08:37 PM	#1
ECU PIRATE Registered User Join Date: Apr 2009 Location: Centreville, Virginia Posts: 846	Manual tranny swap Finally got around to dropping in my Muncie tranny after two years of talking about it. To get the hole in the tranny mount to line up with the hole in the crossmember, I had to disconnect the motor mounts from the frame and move them back. At lest the tranny is in and the driveshaft is hooked up. Anyone run into this problem before? May need to drill new holes in the frame and engine crossmember to get everything buttoned down. Thanks, Mike Posted via Mobile Device __________________ The Fleet........ 68' Camaro - 1st car (restored & still have it) 09' VW Tiguan (Wife's Daily Driver) 14' VW Passat SE TSI (my personal) 14' Ford Edge Sport (Daily Work Vehicle) 73' SWB Stepside - 77K org. miles 74' LWB 454/TH400 - drive train transplant for my (Sold) 98' SWB C1500 W/T - shop truck (Sold) 90' GMC Sierra SLE short step - aka " Jezabelle " (Sold)

11-17-2012, 08:48 PM	#2
Seventy Registered User Join Date: Oct 2012 Location: Kansas Posts: 22	Re: Manual tranny swap Not that there is a wrong way, if youre building it custom to your liking. Typically though, you leave the engine placement the same, and move the transmission crossmember, then shorten/lengthen the driveshaft. Moving your motor rearward isnt a bad thing, if everything clears, you just took the less traveled route.

11-18-2012, 01:39 AM	#3
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: Manual tranny swap There are usually different holes in the frame for different transmission options. __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)

11-19-2012, 08:27 AM	#4
ECU PIRATE Registered User Join Date: Apr 2009 Location: Centreville, Virginia Posts: 846	Re: Manual tranny swap some shots Attached Images __________________ The Fleet........ 68' Camaro - 1st car (restored & still have it) 09' VW Tiguan (Wife's Daily Driver) 14' VW Passat SE TSI (my personal) 14' Ford Edge Sport (Daily Work Vehicle) 73' SWB Stepside - 77K org. miles 74' LWB 454/TH400 - drive train transplant for my (Sold) 98' SWB C1500 W/T - shop truck (Sold) 90' GMC Sierra SLE short step - aka " Jezabelle " (Sold)

11-19-2012, 08:44 AM	#5
SSC's76 No No Join Date: Jun 2005 Location: Pueblo Colorado Posts: 1,781	might be a stupid question not knowing all the details but this trans should bolt up exactly where a th350 did as far as crossmember placement what kinda trans did you have in it before? Posted from 67-72chevytrucks.com App for Android __________________ 1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler

11-19-2012, 09:01 AM	#7
ECU PIRATE Registered User Join Date: Apr 2009 Location: Centreville, Virginia Posts: 846	Re: Manual tranny swap Should be exactly 1/4" bell housing to mount difference between the TH200 (20 1/8") and the TH350 (20 3/8"). This is what I was off. My truck was originally a 6 banger with a TH350 Posted via Mobile Device __________________ The Fleet........ 68' Camaro - 1st car (restored & still have it) 09' VW Tiguan (Wife's Daily Driver) 14' VW Passat SE TSI (my personal) 14' Ford Edge Sport (Daily Work Vehicle) 73' SWB Stepside - 77K org. miles 74' LWB 454/TH400 - drive train transplant for my (Sold) 98' SWB C1500 W/T - shop truck (Sold) 90' GMC Sierra SLE short step - aka " Jezabelle " (Sold)

11-19-2012, 10:51 AM	#8
Seventy Registered User Join Date: Oct 2012 Location: Kansas Posts: 22	Re: Manual tranny swap Pirate, have you drilled your front crossmember already? If you only have 1/4 inch difference, that isnt going to put much distance between your old and new motor mount holes. I'd be alittle concerned with swiss cheesing it up too much. Probably will be fine, Im just anal like that. Also, its cool you finally got it installed. Granted I just joined, but awhile back I was searching about putting a muincie in mine, and came across your older threads.

11-20-2012, 10:08 AM	#10
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: Manual tranny swap Woohoo for progress! You'll be banging gears before ya know it. __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD

11-20-2012, 04:29 PM	#11
68Timber I know the pieces fit Join Date: Nov 2007 Location: MONTGOMERY, AL Posts: 5,523	Re: Manual tranny swap Usually folk bolt the crossmember to transmission and drill holes in the frame to bolt it in its new spot. Make sure the dist cap is good for clearance and it shouldn't matter. How much trouble was it installing the linkage and pedals? Love the vintage valve covers btw. __________________ John 79 2wd Blazer (Bruiser) 85 M1009 Blazer (Sarge) build 74 Honda Z50 build

11-20-2012, 06:02 PM	#12
thesickc10 Registered User Join Date: Sep 2010 Location: New Hope, PA Posts: 279	Re: Manual tranny swap Hey would you mind measuring how far back from the firewall you made that hole for the shifter? im doing the same thing right now but with a supert10. How you going mechanical or hydraulic clutch? __________________ 1985 c10 355 th350 (working on 4 speed conversion to super t10) 1979 camaro 358 super t10 2003 f250 superchip slp exhaust

11-20-2012, 08:45 PM	#15
thesickc10 Registered User Join Date: Sep 2010 Location: New Hope, PA Posts: 279	Re: Manual tranny swap cool thanks man. __________________ 1985 c10 355 th350 (working on 4 speed conversion to super t10) 1979 camaro 358 super t10 2003 f250 superchip slp exhaust

11-22-2012, 08:53 AM	#16
ECU PIRATE Registered User Join Date: Apr 2009 Location: Centreville, Virginia Posts: 846	Re: Manual tranny swap Here you go bro. I will be heading back to Easton, Pa in about a month for X-Mas Posted via Mobile Device Posted via Mobile Device Attached Images __________________ The Fleet........ 68' Camaro - 1st car (restored & still have it) 09' VW Tiguan (Wife's Daily Driver) 14' VW Passat SE TSI (my personal) 14' Ford Edge Sport (Daily Work Vehicle) 73' SWB Stepside - 77K org. miles 74' LWB 454/TH400 - drive train transplant for my (Sold) 98' SWB C1500 W/T - shop truck (Sold) 90' GMC Sierra SLE short step - aka " Jezabelle " (Sold)

11-22-2012, 08:54 AM	#17
ECU PIRATE Registered User Join Date: Apr 2009 Location: Centreville, Virginia Posts: 846	Re: Manual tranny swap Posted via Mobile Device Posted via Mobile Device Posted via Mobile Device Attached Images __________________ The Fleet........ 68' Camaro - 1st car (restored & still have it) 09' VW Tiguan (Wife's Daily Driver) 14' VW Passat SE TSI (my personal) 14' Ford Edge Sport (Daily Work Vehicle) 73' SWB Stepside - 77K org. miles 74' LWB 454/TH400 - drive train transplant for my (Sold) 98' SWB C1500 W/T - shop truck (Sold) 90' GMC Sierra SLE short step - aka " Jezabelle " (Sold)

11-22-2012, 08:55 AM	#18
ECU PIRATE Registered User Join Date: Apr 2009 Location: Centreville, Virginia Posts: 846	Re: Manual tranny swap Posted via Mobile Device Happy Thanksgiving to all.............. Posted via Mobile Device Attached Images __________________ The Fleet........ 68' Camaro - 1st car (restored & still have it) 09' VW Tiguan (Wife's Daily Driver) 14' VW Passat SE TSI (my personal) 14' Ford Edge Sport (Daily Work Vehicle) 73' SWB Stepside - 77K org. miles 74' LWB 454/TH400 - drive train transplant for my (Sold) 98' SWB C1500 W/T - shop truck (Sold) 90' GMC Sierra SLE short step - aka " Jezabelle " (Sold)

11-22-2012, 10:06 AM	#19
thesickc10 Registered User Join Date: Sep 2010 Location: New Hope, PA Posts: 279	Re: Manual tranny swap awesome thanks man! Easton is only about 45 minutes from me. Are you bringing your chevy for the holidays? __________________ 1985 c10 355 th350 (working on 4 speed conversion to super t10) 1979 camaro 358 super t10 2003 f250 superchip slp exhaust



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