4.3l tranny/bell housing bolts - S-10 Forum
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post #1 of 8 Old 04-14-2019, 02:43 AM Thread Starter
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4.3l tranny/bell housing bolts

on the 1999 engine, are the tranny mount bolts the only ones that were either metric or sae? anywhere else on this engine it could be sae? just want to be sure if I get a 1999 sae engine I get bolts to cover all sae locations. it is going into a 2000 S10. making sure that I can mount all accessories.

thanks for the help!!

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post #2 of 8 Old 04-14-2019, 08:34 AM
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Re: 4.3l tranny/bell housing bolts

To the best of my knowledge (which is far from perfect) the only bolts changed in 00 were the bellhousing bolts.
I put an 00 engine in my 97 Blazer years ago and that was the only thing I had to change.
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post #3 of 8 Old 04-14-2019, 09:49 AM
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Re: 4.3l tranny/bell housing bolts

Bell housing bolts are the only metric bolts installed by the factory.

I've seen where Bubba installed M10x1.5 (class 10.9 at least) bolts for the motor mounts. I guess that works better than loctite. Lucky for me, they used really short (like 16mm long) bolts there, and I was able to just run a 3/8-16 tap into the hole, all the way to the bottom and install the longest 3/8-16 bolts that would fit (1" long IIRC) and they held just fine.

If you can't light up the tires in the first three gears, you need more power.
If you can light up the tires in the first three gears, you need better tires.
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post #4 of 8 Old 04-15-2019, 05:01 PM Thread Starter
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Re: 4.3l tranny/bell housing bolts

ok thanks. so originally the 4.3 started as a metric block with standard trans mount bolts and in 99 they started to change these tranny bolts to metric?
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post #5 of 8 Old 04-15-2019, 05:07 PM
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Re: 4.3l tranny/bell housing bolts

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Originally Posted by pmpueo View Post
ok thanks. so originally the 4.3 started as a metric block with standard trans mount bolts and in 99 they started to change these tranny bolts to metric?
Negative.

The 4.3 started as an SAE block (and heads), and they went metric on the bell housing bolts (only) on the late year engines.

The block and heads are all tapped SAE sizes. The oil pan and intake are tapped metric. The general rule on the Vortec 4.3 is, if the bolt is threaded into cast iron (or steel), it's SAE, if it is threaded into aluminum (or plastic), it's metric. The bell housing bolts are the only exception I'm aware of. On the early engines, all of the bell housing bolts were SAE, even the ones that go into the aluminum oil pan. On the late year engines, all of the bell housing bolts are metric, even the ones threaded into the cast iron block.
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If you can't light up the tires in the first three gears, you need more power.
If you can light up the tires in the first three gears, you need better tires.
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post #6 of 8 Old 04-15-2019, 05:14 PM Thread Starter
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Re: 4.3l tranny/bell housing bolts

thanks Racer. been checking threads on engine interchange and 99 comes up as time when GM changed the tranny mount bolts. I want to make sure nothing else is different on a 99 engine. clears up my uncertainty.
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post #7 of 8 Old 04-15-2019, 05:28 PM
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Re: 4.3l tranny/bell housing bolts

I thought of the other exceptions.

The water pump hub/pulley bolts are threaded into steel, but metric, and the stud for the fan clutch is also metric, as are the bolts holding the fan blades to the clutch.

Also any of the accessories hanging on the brackets are generally metric for the parts of the accessory itself (alternator, AC compressor, etc), and the mounting bolts are obviously metric because the thread into the aluminum accessory brackets, covered by the general rule in my earlier post.

If you can't light up the tires in the first three gears, you need more power.
If you can light up the tires in the first three gears, you need better tires.
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post #8 of 8 Old 04-15-2019, 05:58 PM Thread Starter
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Re: 4.3l tranny/bell housing bolts

this is good info. should be placed with interchange info. I was worried if I got a 99 block that was SAE, all the threads would be SAE and I would have a nightmare swapping bolts. only tranny bolts is a good thing.
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