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#1 |
Registered User
Join Date: Jan 2010
Location: Tempe, AZ
Posts: 9
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1967 GMC - 305 V6 - TH400 Flexplate
I have a 1967 3/4 ton GMC with a 305 V6 and a TH400. The truck is completely stock and was handed down to me by my grandfather who was the original owner. The truck has one problem... it has a cracked flexplate and I need to get it replaced or fixed (it's cracked on one of the tabs where it's bolted to the torque converter). The problem is that I can't find a replacement flexplate anywhere! It's not your regular run of the mill 350 v8 style flexplate... it looks more like a 235 I-6 flywheel with a small triangular shaped flexplate attached to the back.
Does anyone know where I can find a replacement flexplate (used or new) for my truck? Has anyone else run into this problem with the GMC 305 V6s and automatic transmissions? Has anyone had any luck taking parts like this to a machine shop to get fixed? Can it be fixed? Any suggestions and ideas you have would be greatly appreciated. Thank you very much! |
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#2 |
Registered User
Join Date: Feb 2007
Location: west coast
Posts: 3,372
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Re: 1967 GMC - 305 V6 - TH400 Flexplate
Go to the "6066gmcguy" website for a link to a company who makes auto trans parts for this engine. Once on site, click on Transmission Data, in the middle of home page. Automatics is near bottom of this page. Bendtsens Trans Adapters make have what your looking for.1966 GMC's also used the 305 with the TH400.
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#3 |
Registered User
Join Date: Jan 2010
Location: Tempe, AZ
Posts: 9
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Re: 1967 GMC - 305 V6 - TH400 Flexplate
Thank you for the information, I really appreciate it. I'll look into it and post what I find out. Has anyone done business with this company? If anyone has an original flexplate to sell, please let me know. Thanks!
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#4 |
Account Suspended
![]() Join Date: Apr 2007
Location: Powell, Wyoming
Posts: 4,973
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Re: 1967 GMC - 305 V6 - TH400 Flexplate
PM sent. Sharpie
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#5 |
Registered User
Join Date: Jan 2010
Location: Tempe, AZ
Posts: 9
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Re: 1967 GMC - 305 V6 - TH400 Flexplate
Sharpie: Thanks for the PM... lets keep in touch.
As a side note, does anyone know if a Powerglide flexplate will work with the TH400 transmission with the 305 v6? |
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#6 |
Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: 1967 GMC - 305 V6 - TH400 Flexplate
To see a cracked flex plate is not uncommon - especially to guys in trans repair shops - it happened a lot with some models.
Careful - if it cracks very much and enables play or vibration of the shaft and you drive too many miles that way it can begin to throw shavings and pieces inside the box - stuff gets pumped throughout and you will need a rebuild. Talk to a good trans shop - they know where to get them used and new - and they know which ones are stronger. Sooner is better.
__________________
CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp Last edited by CCCC; 01-16-2010 at 10:14 PM. |
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#7 |
Registered User
Join Date: Jan 2010
Location: Tempe, AZ
Posts: 9
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Re: 1967 GMC - 305 V6 - TH400 Flexplate
Thanks for the advice! Are there typical reasons for cracks to develop on a flexplate?
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Tags |
1967, 305 v6, flexplate, flywheel, transmission |
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