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flex plate swap

 
85k25
I love my Chevy Chevette!
Posts: 4
Joined: 10/08
Posted: 11/11/09 07:06 AM

I recently bought an 83 chevy 3/4 ton parts truck to repair my 85 3/4t.  The parts truck has a 305 with a turbo 400, I want to put the th400 in my truck with my 350 that was originally in my truck.  Can I use the flexplate off the 305 on my 350 without complications or do i have to buy a new one?  Thanks for any info in advance.  

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 11/11/09 07:00 PM

The 305 flexplate will work just fine. Make sure to check the flexplate for cracks at the torque convertor and crank boltholes. Check the teeth for wear too. If it checks ok bolt it on  
luck is when skill and opportunity meet

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85k25
I love my Chevy Chevette!
Posts: 4
Joined: 10/08
Posted: 11/11/09 10:28 PM

Thanks alot!  

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Pontiacman2
Moderator
Posts: 8956
Joined: 09/08
Posted: 11/12/09 06:56 AM

Most 305's I have seen have a 153 tooth flex plate and the 350 has a 168 tooth flex plate the starter from the 168 tooth flex plate will not work with the 153 tooth 305 flex plate I would count the teeth on the original flex plate and get one with the same amount of teeth that the original had.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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skyeking
I mow my lawn and find Chevys
Posts: 2738
Joined: 08/09
Posted: 11/12/09 04:38 PM

Smile  Hi people,
  I have used a 168 tooth flex plate on my earlier Chev /Jag conversion as
  I needed the 6 bolt holes for the Jaguar torque converter to fit straight
  on to the offset drilled USA flexplate and had no problems as a result
  on the 305...
  The gearbox was a Jag/TH400 which uses 98% USA parts.
    My 106 Adaptor kit was made in Australia and was a complete
  success and interchanged with the later 355 I had built later and is still
  working in another Jaguar transplant in another state 6 years later..
   Both Blocks were very early castings..
                                         All the best from Skyeking Smile  
skyeking

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 11/12/09 05:22 PM

168 tooth flexplate uses staggered bolt pattern starter/153 uses the straight across bolt pattern starter. 168 tooth flexplate will be a little over 14" across and the 153 tooth flexplate will be a little under 13" across. Match  the starter to the flexplate or vice versa  
luck is when skill and opportunity meet

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85k25
I love my Chevy Chevette!
Posts: 4
Joined: 10/08
Posted: 11/12/09 10:13 PM

I should have mentioned in my initial post that the 350 had a 4 speed mated to it so it has a flywheel not a flexplate.  But i was already thinking about counting the teeth and then swaping starters if needed.  Thanks again everybody.  

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 11/13/09 04:38 AM

Same principle. good luck  
luck is when skill and opportunity meet

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