727 shifting at 4100 RPM

[wyrmrider]

The street hemi is .375 deep, the x ram .450 which gives about 200 more rpm
two stage
inner weight bottoms out so high rpm is inner weight (and spring)
governor pressure is not affected by variations but cannot be higher than line pressure
governor pressure acts on the governor plugs in the valve body to move the 1-2 or 2-3 shift valves
at wot, max throttle pressure- max governor pressure is required to move the shift valves
reducing the spring tension at its installed height of .618 (usually) will increase full throttle upshift speeds
decreasing the inner weight increses bothpart throttle and full throttle upshift speeds
lightest weight was 3515149 see if avail or superseded (lotsa luck) non club foot weight-
early non club foot weight and late spring will give you that 6000 rpm shift

 

[BSB67]

Personally, I would not cut coils off the spring. I can send you a lighter spring. Once you pick your spring, weight removal is more predictable, IMO.

 

[BSB67]

The street hemi is .375 deep, the x ram .450 which gives about 200 more rpm

Garys1969RR, in case it is not clear, this is for a different inner weight and spring than what you have. The change might be similar, but actual shift point will be much different.

 

[Garys1969RR]

Ok, got the RV governor out, and the weight has a little less countersink in the top as you can see in the pictures, compared to the late 60s 727 weight.

RV weight is on the top, and is heavier due to less countersink. So it shifts at a lower RPM, under WOT.

 

[Garys1969RR]

Ok here is the RV ( 4100 shift point) and the other used governor I have. Showing the margin thickness. They are both the same at about .150" thick. Only the countersunk 3/8 hole on the other end is smaller on the RV weight, which would make it heavier.

 

[wyrmrider]

Let's be clear how shifting works
Throttle valve increases throttle valve pressure
Low pressure from the governor allows high pressure in the valve body to shift
Higher pressure from the governor keeps the pressure in the valve body from shifting till later
Those pics are from the late model 70 and later "club foot" governor
without a shift kit adjust your line pressure up but as I said before lots of line pressure tears up clutches on the street

 

[Garys1969RR]

Let's be clear how shifting works
Throttle valve increases throttle valve pressure
Low pressure from the governor allows high pressure in the valve body to shift
Higher pressure from the governor keeps the pressure in the valve body from shifting till later
Those pics are from the late model 70 and later "club foot" governor
without a shift kit adjust your line pressure up but as I said before lots of line pressure tears up clutches on the street

So will I be able to raise the shift point with a lighter spring and a lighter weight?

 

[miller]

Might help...
https://www.forbbodiesonly.com/moparforum/threads/727-trans-governor-differences.120487/

 

[dvw]

lots of line pressure tears up clutches on the street

How does line pressure "tear up clutches"?
Doug

 

[wyrmrider]

I don't know maybe hard shifts at part throttle
just that 150 lbs is not a good idea
Art Carr had a kit that really raised line pressure but trans did not last, junked the valve body, but it really churped the tires
TRANSGO is just a couple of blocks from one of my old places- I use their stuff- much more reliable
I'm putting in their new separator plate for the OD trans Christmas Vacation

 

[Garys1969RR]

To remove the governor you must remove the tail shaft housing, which in my mind is a bigger pain than changing a valve body.

That's for sure! Especially when the tranny cross member is securely mated to the tranny mount! It is, on an A Body. You have to remove the 2 bolts holding the mount to the tranny. Found out after I got it out, there are 2 holes to access the tranny mount bolts. LOL

 

[Garys1969RR]

Update: OK, installed a 5600 RPM governor from A&A, that raised the 2-3 shift to 4600 PRM. The 1-2 still shifts at 4000. So I got 500 more RPM with the new governor, on the 2-3 shift, so moving in the right direction. I'm thinking the line pressure may be too low, so I ordered a heavier spring to raise it. I noticed a post showing the FSM setting the spring height at 1 5/16", Does that seem right? Also ordered a 1-2 upshift spring kit from A&A, and it comes with a white spring that raises it 500 RPM, and the red one raises it 1000 RPM. He said to start with the white one. Don't have a gauge to check the line pressure, although I am looking for one.

 

[Lenny459]

I'm having some of the of the same issues. Yeah I can hand shift and get the 5800 rpm, but I would rather stomp it and get it that way. Pulling the tail shaft is a little harder than the valve body but you don't loose all that expensive atf fluid! Any idea what a 5600 or 5800 weight should weigh? That would get me in the ball park quick.