Adjusting shift points in a TH350... to where? - Chevelle Tech
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  #1  
Old Sep 24th, 06, 2:30 PM
webfoot webfoot is offline
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Default Adjusting shift points in a TH350... to where?

I went to the track for the first time ever this past saturday. I had a blast, btw. One thing I noticed is that my transmission shifts too soon. The motor is a 385 and the cam is a 234/234 a .05 and makes a whopping .488 valve lift with 1.5 rockers. I have dart iron eagle heads with 2.02/1.6 valves and 200 cc runners. My rear gear is a 3.31. Where should I be looking to make this thing shift? I don't really want to manually shift so I am going to buy one of those B&M kits to make it shift where I want in D. It is currently shifting between 4 and 4.5K RPMs. I think it should run to at least 5500. I am using a stock cast crank if that matters, and recon rods with ARP bolts. My CR is about 10.3:1 and I have no detonation issues.
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  #2  
Old Sep 24th, 06, 2:52 PM
jakeshoe jakeshoe is offline
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Default Re: Adjusting shift points in a TH350... to where?

Don't waste your money on the B&M kit:
Go here and spend 1/40th of the money to do the same thing.

http://www.nastyz28.com/forum/showth...vernor+weights
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  #3  
Old Sep 24th, 06, 3:28 PM
webfoot webfoot is offline
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Default Re: Adjusting shift points in a TH350... to where?

Wow, that is awesome - do you have a pic of the reassembled governor, just so I can see how and where you bent the nail over, or does it not matter?

Also, where can one find the right springs to change to a lighter one if necessary?
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  #4  
Old Sep 24th, 06, 9:33 PM
mr 4 speed mr 4 speed is offline
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Default Re: Adjusting shift points in a TH350... to where?

This has inspired me..been meaning to do this for a long time.
I have a spare TH400 I just robbed the gove. out of.
I ground down the "spears" and took it apart.I will grab the nails at the hardware store and grind the weights down tomorrow and install in my Chevelle.
I'd do it right now,but I need the nails,by daugher is sleeping (she was still up when I ground the off the spears ) and the roads are a little wet.
My TH400 in my 'velle shifts around 4500 (even though its a CY code TH400 with high shift points) so I'd be happy with 5200 or so.
Thanks again Jake,I will post my results.
Sure beats spending cash on the B+M kit and the fact you can do it yourself and learn something in the process.

Jake,in the fourth picture down,do both of the weights need to be ground like the one on the left to achieve 5000 RPM's ?
Thanks in advance.
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  #5  
Old Sep 25th, 06, 12:39 AM
jakeshoe jakeshoe is offline
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Default Re: Adjusting shift points in a TH350... to where?

Clark,
Set the governor on a hard surface, and bend the ends of the nails towards the center, or towards each other. I just tap them over with a small hammer.

Chris,
Yes the weight on the left will usually get you about where you want to be. And yes grind both of the smaller weights to look like the one on the left.
You may have to play with it a bit to get it where you want.
The shift valve springs in the valve body have an affect on this as well, so there isn't a set amount of weight that can be removed.

Also on the factory performance governors, they had a large hole drilled in the outer weight, and some of the weights were thinner, so lighter, even though they didn't appear different at first glance.

The outer weights seem to affect the part throttle 1-2 the most, so if your car feels like it shifts to 2nd too soon when you leave a stoplight at part throttle, work on these.
The inner weights affect the WOT shifts on the 1-2 and the 2-3, but always seem to make a slightly bigger difference on the 2-3.
If you get pretty crazy with them, you may have to go into the valve body and play with the shift valve springs to make it all shift perfect.
You could spend 2-3 full workdays getting one PERFECT but usually a couple of hrs and you can get one pretty close and be MUCH better.
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  #6  
Old Sep 25th, 06, 1:23 AM
webfoot webfoot is offline
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Default Re: Adjusting shift points in a TH350... to where?

I also forgot to ask - do you trim the extra length of the nail off a certain length past the bend, or can you leave the whole thing intact?
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  #7  
Old Sep 25th, 06, 1:31 AM
jakeshoe jakeshoe is offline
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Default Re: Adjusting shift points in a TH350... to where?

No trimming necessary.
It will be about maybe 3/16" to 1/4" longer than the governor is wide, just bend it over.
Buy a small box of the nails and they will last YEARS, even if you build trannies often. I bought a box probably 3-4 yrs ago, and still have half of them. I'm talking one of the .79 cent boxes with maybe 100 of the little nails. You can probably pick these up from Wal-mart. I think I bought my box at Ace hardware.
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  #8  
Old Sep 25th, 06, 1:38 AM
webfoot webfoot is offline
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Default Re: Adjusting shift points in a TH350... to where?

Thanks Jake for the advice, and for saving me some cash - I'm definitely going to go this route and I'll let you know how it worked!
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  #9  
Old Sep 25th, 06, 7:49 AM
DOUG G DOUG G is offline
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Default Re: Adjusting shift points in a TH350... to where?

This comes at a great time too. My car has always shifted way early, didn't matter if it had the 2.73's or 3.73's. I have almost always manually shifted mainly now since I installed the auto/manual kit.
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  #10  
Old Sep 25th, 06, 10:46 AM
Georgia69 Georgia69 is offline
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Default Re: Adjusting shift points in a TH350... to where?

With respect to jakeshoe, the B&M kit is only $29 and turns a 90 minute job into a 30 minute job. Having done this modification a few times, if you tell me what RPM you want to shift at, I can just about tell you what weights to use from the kit.
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  #11  
Old Sep 25th, 06, 11:02 AM
DOUG G DOUG G is offline
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Default Re: Adjusting shift points in a TH350... to where?

6500
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  #12  
Old Sep 25th, 06, 11:10 AM
Georgia69 Georgia69 is offline
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Default Re: Adjusting shift points in a TH350... to where?

Quote:
Originally Posted by DOUG G View Post
6500
The #3 and #4 give you 56-5800, the #4 and #5 give 6000 or a little higher, so probably the #5 and #6 would get pretty close.
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Old Sep 25th, 06, 11:11 AM
jakeshoe jakeshoe is offline
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Default Re: Adjusting shift points in a TH350... to where?

OK,
So my method costs 1/30th as much

The advantage of the kit is it does include springs , gaskets, and the little "axles" instead of using nails, however I would lose the clips anyway, so the nails work better for me.

I have an assortment of springs that I sometimes play with, but usually I just take weight off until I get it where I want it.

It doesn't take me that long to grind the weights, and I have a pretty good idea how much to go so it's not a 90 minute job for me.

http://store.summitracing.com/egnsea...115+4294849137

6500 rpm shifts will need the secondary weights cut down about as much as you can go.
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  #14  
Old Sep 25th, 06, 11:19 AM
DOUG G DOUG G is offline
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Default Re: Adjusting shift points in a TH350... to where?

Thanks.
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  #15  
Old Sep 25th, 06, 1:52 PM
Georgia69 Georgia69 is offline
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Default Re: Adjusting shift points in a TH350... to where?

Quote:
Originally Posted by jakeshoe View Post
OK,
So my method costs 1/30th as much

The advantage of the kit is it does include springs , gaskets, and the little "axles" instead of using nails, however I would lose the clips anyway, so the nails work better for me.

I have an assortment of springs that I sometimes play with, but usually I just take weight off until I get it where I want it.

It doesn't take me that long to grind the weights, and I have a pretty good idea how much to go so it's not a 90 minute job for me.

http://store.summitracing.com/egnsea...115+4294849137

6500 rpm shifts will need the secondary weights cut down about as much as you can go.
I'm not as experienced as you obviously, so all the trips to the store for nails & gaskets are a fair trade for the $29 to me
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