99 vortec Flexplate ring gear

VortecBurb · Jun 20, 2019

I bought a new flex plate Pioneer FRA159 for the new engine and if I put the old plate over the new plate to make sure everything lines up the only way to get the TC holes to lineup is to have the new plate gear teeth sitting in between the gear teeth of the old plate. Will that cause any problems?

VortecBurb · Jun 20, 2019

emailed Pioneer they said ring gear positioning will not affect timing

JackE · Jun 20, 2019

Gear teeth position on the flex plate will not affect anything. Diameter and tooth count is what matters. The only thing I have seen the placement of the teeth affect is when there is worn out teeth. You can't move the ring gear on a flex plate very easy, but on a fly wheel the ring gear can be turned which moves the placement on the flywheel. This can be handy if you have some worn teeth because the engine will usually stop in one of a few specific places and if it's always at the place with the worn out teeth it can cause the starter to grind instead of turning the engine. I had an old 350 like this and about half the time I had to get out and rotate the engine a 1/4 turn so the starter would engage and spin the engine to get it started.

Schurkey · Jun 20, 2019

What you NEED to verify is the size and placement of the balance weight on the new flexplate compared to the old one.

The balance weights of two aftermarket flexplates I bought were in the correct location, but totally wrong in terms of size/weight.

I had to pay extra to the machine shop to correct the balance of the two aftermarket flexplates. They removed weight from one, and had to add weight to the other.

The way I remember it, the Pioneer was way heavy. The other was a no-name, and was too light.

VortecBurb · Jun 20, 2019

yea I was thinking I needed to make sure that weight was in the right place and right size
so many flexplates out there I know in my 6.5L the flex plate broke at about 150K and I'm right about
the same on this one

VortecBurb · Jun 20, 2019

does it matter where the weight is as long it is balanced?

Schurkey · Jun 20, 2019

VortecBurb said:
does it matter where the weight is as long it is balanced?

If the weight is not placed properly, it cannot be "balanced".

The weight has to be the proper size (in grams or ounces) and it has to be located so that it counteracts a light spot in the crankshaft balance. If the weight is too heavy or too light, or out-of-position, you've failed to properly balance the crank assembly.

VortecBurb · Jun 21, 2019

Well they weigh the same and the weight looks to be the same size and in the same location as the old one so I think it will be fine

VortecBurb · Jun 21, 2019

I'm gonna try to drop the motor back in and was looking for the torque specs for the flexplate to torque converter bolts. I saw where some forums mentioned blue locktite and 35 lbs but I didn't see any on the bolts I removed thanks for all the help so far

VortecBurb · Jul 4, 2019

any ideas what the torque specs are for the flexplate to torque converter bolts

99 vortec Flexplate ring gear

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