What rpm do you shift your AT at...

Boy.....You and Jeff are really working those engines for those 10 seocnd slips............ou: :grin: :laugh: p :moonu: :moonu: :moonu: :moonu:

 

Mat it and leave on the trans break

Converter is my old one, stalls at 4600 rpm ( need a new one)
On dyno peak torque 654 is at 5500 rpm's, HP peaks 779.8 at 7,000 rpm

1st gear shift 7100
2nd gear shift 6900
through the traps 7,000

weight w/driver 3,070 pounds

 

Mine is shifting at 4950, regardless of me manually shifting it. It would run better if it allowed me to shift at around 5400. So, what mods need to be done to the trans to get it to shift where I need it to?

 

John,

Use the B&M kit listed above. Should be available from Jegs or Summit for under $30. In my case, I used the #2 and #3 weights and one green, one yellow spring for 5700rpm shifts. Experimentation with combos will net the results you want. It's not difficult but plan on losing a pint or so of fluid each time you pull the governor.

 

I try to hit my shifts at 5900to6000, I hit the big end about the same rpm. I have been thinking about modifying the trans to shift itself at 5900. Right now it shifts at about only 4600 in drive. I tried modifying the governor to raise the shift but my light throttle shift points went sky high also, it would not shift to 3rd till 60mph at light throttle so I must have done something wrong with the governor. With the stock governor it shifts into drive at about 20mph. Tom

 

Shift from low into high at 7200 and cross at 7400.

 

I shift at 6100 and go through the traps at 5800.

Stock crank and rods, 3.73 gear 28" tire.

Tom Jenkins

 

Gary
It has to kill you that our cars that out weigh you by 400 lbs are knocking on your door. foot brake sixty's 1.36 and 9 second et's out of 470 inch baby motors both have solid lifter cams and basic stuff in them. Next motor you build give us a call and we will help get you into the 9.50's. LOLOLOL

 

Bobb
I don't think you out-weigh me by quite 400lbs.......Oh,You meant the car.....?Sorry.....:laugh: :moonu:


No...It doesn't kill me,I'm glad to bring you the joy.....:TU:

Maybe if you could hit the tree for once in your life you would be even closer to me......LOL!!!!!! I kill me!!!:3gears:

 

LOL:laugh: Boy it got cold in here..burrrr:beer

 

I shift at 7200 rpms and go through the traps at 7500 rpms.

 

John, what are you, kidding? Aren't you the guy who was afraid of rpms? You're running the same basic combination as me and we're running almost identical numbers. Did you really think you could do all that without revving it?? :laugh:

 

WOW:grin:

Somebody struck a nerv:laugh: :laugh: . Man I love the guy's on the board if you can't jab at each other what fun is it. Why does everybody got to bring up my reaction times. That just hurts :moonu: :moonu: .

Hey Gary are you thinking about coming up for the nsca race come on up and bring the pup with you. We park out in the middle of nowhere. I'd love to have a friend there since you seem to have turned on me :TU: come on jeff and I will be there.

 

Doug,

Our combos are VERY similar. I just wish I could get my car to leave the line like yours does. I think some people (I was one of those guys) dont understand ..... if you want to go 155 mph then you must spin the engine to a given RPM to get to that MPH. I guess I was thinking we would be able to go with a lower gear (4.10 or 3.90) to compensate for the rpm. BUT.... the car does not want to leave the line with those gears. So the 4.33s went back in and the car picked up a .10.

Right now I have almost 9% converter slipage. If I can get that down to 6% and save a few hundred trap rpms then we may put in a 4.56 rear gear.

But yes.... I was very wrong in saying your crazy for spinning your engine.... if you want to go fast... ya gotta spin it!

Later

 

Oh come on Johnou: Your talking to "Mr. John Force" of the Buick world. Doug has many times zinged it way up in the stratophere with his aka J.Force burnouts:grin:

And crazy yep your right. Crazy as a fox :laugh: Take a look at his licence plate on his turbo regal...it says it all.

Yep my pal Doug...used to scold me for doing my burnouts in the water:spank:
Cartman watches Kenny real close now:3gears:

See ya

 

i have a fairly stock(headers,shift kit,performer intake,k&n air filters) 73 rivi and it only shifts at 4000. whay do all of your guys trannys shift so much higher than mine? is there something i should know? would it be safe for me to manually shift my tranny at say 5000-5200 or would i just blow up my motor and tranny?
curtis helena mt
79 lesabre
74 electra 225 limited
73 rivi(my baby)

 

Shifting where the number say is the best, isn't always the best. I tend to go seat of the pants. When it stops pulling hard its time to switch. Most cars will still pull hard well past where the numbers say to shift. Course I do very little real drag racing but on the street full rpm shifts tend to win 9x's out of 10.

 

You can get a B&M Shift modifier kit from Summit or Jegs for about $30. Simple procedure of changing weights and springs on the governor to bring your shift points up while leaving the trans in Drive. It takes some trial and error to get it where you want but is not difficult. I'd guess you can move it to 5000 or higher on a stock 455 depending on where it falls off.