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03-18-2010, 06:36 PM
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#1 |
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Registered User
Join Date: Mar 2010
Location: N. Vancouver Island
Posts: 122
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4spd Advice?
Recently picked up a 68 gmc 350/4spd 2wd lwb straight out of the barn, numbers matching all original.. spent about 30 mins got it running.. but not streetable yet..
Anyways, question.. it has a stocker Muncie SM465 .. and my question is to those who run them.. worth keeping it? I pulled mine yesterday to get at the tunnel for some cleaning up and the tranny is leaking from every where possible.. worth the rebuild? Or should I be looking at going with another tranny format? np435 or heading auto 700r4? t400 etc... Thanks in advance 
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03-18-2010, 06:47 PM
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#2 |
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Watch out for your cornhole !
 
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: 4spd Advice?
It's up to your personal preference. Last SM465 I rebuilt ran me about 75 dollars for the parts. One thing is for sure, you're not going to ever tear the 4 speed up unless you really try to do it. GM never used a stronger manual trans in a light truck.
You just have to ask yourself whether you will be happy with a clunky truck transmission or whether you want an auto or auto with overdrive.
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I'm on the Instagram- @Gearhead_Kevin |
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03-18-2010, 07:10 PM
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#3 | |
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Registered User
Join Date: Mar 2010
Location: N. Vancouver Island
Posts: 122
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Re: 4spd Advice?
Thanks for the reply, yeah im thinking at the cost of what it will be to rebuild, why not.. plus I think if I went auto id miss the sloppy old beast... plus within posts I decided to check the rear end out, looks like someone along the lines replaced the rear end... ive figured 4.11 gearing .. guess I won't be seeing any hwy's anytime soon..
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03-18-2010, 08:13 PM
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#4 |
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Registered User
Join Date: Nov 2007
Location: Indianapolis
Posts: 1,161
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Re: 4spd Advice?
a turbo 350 is not too hard to swap in
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03-18-2010, 09:36 PM
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#5 | |
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Senior Member
Join Date: Apr 2002
Location: Help! I'm in an office park with its own network of freeways!
Posts: 470
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Re: 4spd Advice?
Quote:
 I like my creeper gear in traffic too. The Caprice likes to surge ahead in stop-and-go traffic, but the truck idles along in first. I barely have to touch the clutch. Definitely keep the 4spd.
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'67 C20--427 tall deck/SM420, 4.10 HO52 (Michigan has not been kind to the Old Man) '95 Caprice--355 LT1/T56/3.42 8.5" 10-bolt (daily driver, almost 300k on the chassis) '07 Outback--wife's car. 125k & counting. No head gasket or transmission issues yet. *fingers crossed* |
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03-18-2010, 09:17 PM
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#6 |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: 4spd Advice?
I have a SM 465 in my '67, and it's pretty cool - I like driving around with it. I would keep it if I were you.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD  Click here to support the board Philippians 4: 6-7 |
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03-18-2010, 11:38 PM
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#7 |
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Registered User
Join Date: Mar 2010
Location: Swift Current , Sask
Posts: 42
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Re: 4spd Advice?
The 465 is a good trans. They built them forever. Much better trans than my 420 in my '67 k20. Way cooler than an auto!!
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03-19-2010, 04:57 PM
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#8 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,228
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Re: 4spd Advice?
It is a tough trans. but are hard to o-haul. If it's just leaking it is easy to put seals in.
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