rebuild TH350 or swap to muncie 4 spd - Team Camaro Tech
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post #1 of 17 (permalink) Old Oct 13th, 09, 05:54 PM Thread Starter
kevin
 
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Exclamation rebuild TH350 or swap to muncie 4 spd

Hello everyone, long time no talk... anyways, so my TH350 is having some issues.... driving it the otherday it did fine up until the time i needed to use reverse to do a three point turn. when shifting to reverse it managed to "stay" in drive and only went forward...long story short " P, R, 2Nd, L " all feel like its in drive and i'm standing on the brakes " N, D " feels like straight drive with no issues. Transmission fluid is perfect, shift link is great. should i attempt to rebuild or just upgrade to a muncie to increase fuel economy (same speed lower RPM)
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post #2 of 17 (permalink) Old Oct 13th, 09, 06:15 PM
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Re: rebuild TH350 or swap to muncie 4 spd

Muncie 4-speed or better yet a Tremec 600 5-speed with overdrive.

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post #3 of 17 (permalink) Old Oct 13th, 09, 08:41 PM
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Re: rebuild TH350 or swap to muncie 4 spd

I would not waste $ on rebuilding a TH350. If your plan is to convert from auto to manual tranny then spend the $ there. If gas mileage is your goal then skip right past the Muncie 4 speed on to a TKO 600. When my TH350 died every shop told me that they will gladly take my $ and rebuild it but for a little more I could have a lot more than TH350 boat anchor. I went with a 700R4 as I wanted to stay with an auto tranny.
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post #4 of 17 (permalink) Old Oct 13th, 09, 09:59 PM
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Re: rebuild TH350 or swap to muncie 4 spd

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Originally Posted by zlek131 View Post
I would not waste $ on rebuilding a TH350. If your plan is to convert from auto to manual tranny then spend the $ there. If gas mileage is your goal then skip right past the Muncie 4 speed on to a TKO 600. When my TH350 died every shop told me that they will gladly take my $ and rebuild it but for a little more I could have a lot more than TH350 boat anchor. I went with a 700R4 as I wanted to stay with an auto tranny.
Hey guys I am thinking about this swap as well. What are the exact steps involved besides buying the tranny? Can you make it look stock with the Hurst shifter?

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post #5 of 17 (permalink) Old Oct 14th, 09, 04:26 AM
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Re: rebuild TH350 or swap to muncie 4 spd

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Originally Posted by Z282NV View Post
Hey guys I am thinking about this swap as well. What are the exact steps involved besides buying the tranny? Can you make it look stock with the Hurst shifter?
Joe call classic Chevy 5 speed they are a sponser on team camaro. I used them and my swap was a piece of cake. The technical advice from Jim is outstanding. I have had no issues at all. The OD was a great investment. My 500 HP 406 get anywhere from 15 to 19 mpg where last year with my 302 i got 10 to 12 mpg. Give them a call i dont think you would regret it. Mike
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post #6 of 17 (permalink) Old Oct 14th, 09, 05:22 AM
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Re: rebuild TH350 or swap to muncie 4 spd

The swap to a 4-speed is very straight forward. You can buy the complete clutch setup and there is a ton of info on here and the internet to determine exactly where to cut the hole in the tunnel etc. It is really a bolt on and go thing. In fact if you go with the typical M20 or M21 with the smaller output shaft you should not have to make any modifications to the driveshaft assuming it is the correct length currently. The cross member is the same. You will have to research the speedocable as I had to get a different one for my car but again parts are easily accessible. Good luck and have fun shifting the gears.

A couple of tips to make note of during this is to make sure you get a BRONZE pilot bushing, not the magnetic type most places sell. Also be real sure to index your bellhousing to make sure it is properly aligned so you don't have transmission issues down the road.
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post #7 of 17 (permalink) Old Oct 14th, 09, 10:06 AM
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Re: rebuild TH350 or swap to muncie 4 spd

I've decided to got to a Richmond 4+1 when I pull my TH350, it's supposed to be shipped today.

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post #8 of 17 (permalink) Old Oct 14th, 09, 06:06 PM
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Re: rebuild TH350 or swap to muncie 4 spd

Forget about gas mileage for a while - you are gonna have too much fun shifting.

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327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.
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post #9 of 17 (permalink) Old Oct 15th, 09, 12:02 AM Thread Starter
kevin
 
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Re: rebuild TH350 or swap to muncie 4 spd

so everyone then agrees to drop the th350? if thats the case will i need to change my 256 gears in the rear also? and where is a good place to look to get a good manual for my car (mind you i'm running a 350 csb
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post #10 of 17 (permalink) Old Oct 15th, 09, 02:25 PM
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Re: rebuild TH350 or swap to muncie 4 spd

Not going to get much off the line acceleration with a muncie and 2.56 gears.

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post #11 of 17 (permalink) Old Oct 15th, 09, 03:47 PM
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Re: rebuild TH350 or swap to muncie 4 spd

Look for a four speed with a deep first gear. saginaws went up to something like a 3.50 first gear i think. help me out here guys. and saginaws come a lot cheaper than muncies or T-10's or any of the TKO stuff. otherwise with a close 2.20 or even the middle 2.50-ish first gear, you'll still be feathering the clutch off the line. 2.88 first in my ST-10 and 3.36's or thereabouts in the axle, very little feathering to get moving.
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post #12 of 17 (permalink) Old Oct 15th, 09, 04:30 PM
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Re: rebuild TH350 or swap to muncie 4 spd

I just did the swap form a TH400 to a muncie...not a bad swap at all, and ended up costing me about $2200.00 less than the Classic Chevy/Keisler quotes for their "kits"...
My Muncie was a rebuild I picked up for about $700.00, and pieced the rest of it together with parts from vatrious distrubutor's (Rick's First Gen, Summit, etc)...
Of course, I had to spend a few dollars more that if I already had a TH350, becaus ei needed to pick up a crossmember, and driveshaft...

Keith
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406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
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post #13 of 17 (permalink) Old Oct 15th, 09, 05:26 PM
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Re: rebuild TH350 or swap to muncie 4 spd

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Originally Posted by Aaron67 View Post
Look for a four speed with a deep first gear. saginaws went up to something like a 3.50 first gear i think. help me out here guys. and saginaws come a lot cheaper than muncies or T-10's or any of the TKO stuff. otherwise with a close 2.20 or even the middle 2.50-ish first gear, you'll still be feathering the clutch off the line. 2.88 first in my ST-10 and 3.36's or thereabouts in the axle, very little feathering to get moving.
Yup, I'm running a 3.50 Sag with 2.73 rear. Great combo for take off and highway. Super T-10s can be had with a 3.42 first if you need stronger than a Saginaw. Aaron are you sure you really have a 2.56 rear?

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post #14 of 17 (permalink) Old Oct 15th, 09, 05:37 PM
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Re: rebuild TH350 or swap to muncie 4 spd

must've meant to ask that to kevin... 'cause i got 3.36's, or whatever the 8.2" had that was close to 3 and 1/3 (forgot to count teeth when i had the diff cover off).

didn't the late second gen's come std with some really tall gears? wouldn't be surprised if it was 2.56. oh man, talk about a top end car!!! i'd be dangerous with a car like that on my trips to the high desert haha!
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post #15 of 17 (permalink) Old Oct 15th, 09, 08:03 PM
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Re: rebuild TH350 or swap to muncie 4 spd

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must've meant to ask that to kevin...
Yup, sorry. And I was thinking first gen. 2.56 would be pretty unusual in a first gen.
Quote:
Originally Posted by Aaron67 View Post
didn't the late second gen's come std with some really tall gears? wouldn't be surprised if it was 2.56. oh man, talk about a top end car!!! i'd be dangerous with a car like that on my trips to the high desert haha!
Yeah, I think that's where those Super T-10s were used.

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327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.
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