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Username Post: 84 C1500 starter trouble and mystery block        (Topic#360573)
Motty 
Newbie
Posts: 4

Reg: 04-18-20
04-18-20 09:24 PM - Post#2791477    

Hello all, I've been doing a LOT of searching and reading and have yet to find an answer. I have an 84 GMC Seirra Classic, 2WD, 700R4. Now, I don't know which block I have. The VIN states it originally came with a 305. However, the man I bought it from said it had a 350. And when I replaced the intake manifold and valve covers, the old valve covers said something about being 350. The smart thing would have been to check the casting numbers at that time, but I didn't know to do it then. (This will all make sense shortly)

Now, the main issue - the starter. I recently started hearing that tell-tale grinding noise coming from the starter. I go to replace it and upon removal of the old one three shims come out with it. I install the new starter (350) and I can't manage to get that 1/8" clearance between the bendix and the flex plate. I shim it every which way including trying to use the old shims and still a no-go. I have tried 350 starters, and 305 starters (all reman from O Reilly). No matter what I do, there just seems to be too much space between the two. I'll get 3-4 good starts and then it'll go back to making that hellacious grinding noise again.

I thought maybe the starter is shifting, so I buy one of the brackets that bolts onto the back of the starter and connects to the block. Well, crawl under there today and neither the block nor the starter have provisions for mounting a bracket in that location. I'm really stumped here and need my truck to run. I'd appreciate any help y'all can manage.

Thanks,
Motty



 




gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-19-20 05:45 AM - Post#2791498    
    In response to Motty

Welcome to the board Motty.

Both 350 and 305's use the same starter. All the external parts are interchangeable. The 350 may be a stock GM replacement.

Which bolt patter does the starter have? Are the bolts aligned across or staggered? Does the replacement bolt pattern match or is it universal?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
Motty 
Newbie
Posts: 4

Reg: 04-18-20
04-19-20 06:26 AM - Post#2791499    
    In response to gchemist

It's staggered. I have a 168 tooth flex plate. The replacement starter is staggered as well, not universal.



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-19-20 08:28 AM - Post#2791511    
    In response to Motty

Ok, the starter and flex plate match. Watch this video on how to measure the tooth gaps.
https://www.youtube.com/watch?v=ucG-yh4oiLU

The 700R4 has the removable lower cover. So the starter might not need to come off. You need a 1/8" drill bit or allen wrench.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
Motty 
Newbie
Posts: 4

Reg: 04-18-20
04-19-20 11:44 AM - Post#2791530    
    In response to gchemist

Totally get that. But no matter how I shim it I can't get the starter bendix close enough to the flex plate. I need to measure but it seems like it's at least a 1/4" space.



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-19-20 05:43 PM - Post#2791555    
    In response to Motty

Is the starter new or old? Bendix are known to stick if grease/lube dries up. Old starters stick too.
This video is for newbies, you can probably skip to take it apart and lube the gear.
https://www.youtube.com/watch?v=RhdSq4WOaDM

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
Motty 
Newbie
Posts: 4

Reg: 04-18-20
04-20-20 09:12 AM - Post#2791590    
    In response to gchemist

It'a a reman from Oreilly. Can I still get parts like that from a GM dealer?



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-20-20 10:24 AM - Post#2791595    
    In response to Motty

The starter drive (part that engages) is available on line.


I'm going to move your post over to the Performance Section. You'll get great ideas and more help there.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 




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