possible solution to 700r4 shifting problems

[cbolt]

56 minutes ago, 420ponies said:

I don't remember having any trouble with my 2004r behind my 355/420hp sbc. I just was told to make sure the cable was extended all the way at full throttle. Shifted fine through all mph's and had a firm 1-2 shift (wouldn't break loose tires,I found out I had a 2:73 posi 10bolt) . 2-3rd was fine, overdrive at 55mph and I had a switch to turn on-off overdrive. That had a 2,200 rpm converter.

The 200 4r cable seems to be a whole different animal. Mine is the auto adjust cable too and its so easy even a caveman can do it!

[Jason72]

Cbolt and 420monte, How many rpm did the engine peak at?

Edited May 1 by Jason72

[420ponies]

My engine was low rpm's, 5,500 rpm max. It was a 2 bolt block, but the internal's were all forged parts, might have seen 6,000 at some point. It's been drag raced on occasions. Shift points were 5,200 rpm when at the track.

[Jason72]

Considering the 2.73 gears the output shaft of the trans, which drives the governor, I would think that the governor was “stock” for a corvette or camaro that would have seen 56-5800 rpm but with a taller gear. 
 

this is where the discrepancy come to play- for stockish and mild performance, a stock corvette or camaro governor works fine. 
if you would have put 3:73 gears in the rear axle, it would have shifted much sooner because the output shaft of the transmission would be turning faster for a much lower mph. 
example: 2:73 gears in 3 rd gear at 5500 rpm with a 26” tire would be 155mph. Output shaft rpm would be 5500 then shift to 4th. 
 

change the gear to 3:73 and at 5500 rpm your only going 114 mph. 
 

so in a 700 with a 26 inch tire and 2:73 rear gear the 1-2 shift will happen at 50 mph

2-3 shift at 96 mph

 

Change the rear gear to 3.73 and you get

1-2 at 37 mph and 2-3 at 70 mph. 

so now if you build a high reving engine, and you want it to shift at 7000 rpm, you can’t do that by adjusting the cable. You have to change the governor weights and springs. 
 

this is all for wot. So if you have a combination that shifts at 5500 rpm and the cable is tight at wot, now you change the cam and heads, does the transmission magically shift at 7000 rpm? No. It still shifts at 5500 and the cable is already tight. How can you adjust the cable tighter to get to 7000 rpm? You can not. 

Edited May 2 by Jason72

[cbolt]

5 hours ago, Jason72 said:

Cbolt and 420monte, How many rpm did the engine peak at?

No idea. It's an automatic and I don't have a tachometer. LOL