My gmc motorhome does not stay in low gear very long...so...I cranked the screw inside the modulator ...that made it stay in low and second longer...I liked that so I did some more turning of the screw inside the modulator...Is there any detimental effects from doing this....Brian 77 ele 455 near winnipeg
tranmission modulator
- Thread starter brian waddell
- Start date
Probably not, but invoke Standard Transmission Info Source #1: Call or email Manny.
--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
What turning that Allen screw does is put more tension on a spring that
balances against the force from the vacuum operated diaphram. The harder
you press down on the gas, the less vacuum you have available to move the
diaphram, and the spring becomes the dominant force. Shift point moves up,
and shift becomes a bit harsher. If you feel it is shifting too harsh, back
off the adjustment screw a bit. 1-2 up shift at light throttle occurs when
all is correct at 8 to 14 mph, give or take. 2-3 shift, 25 -35 or so. If
you mash the throttle, then it won't up shift until the governor forces the
shift.
Jim Hupy
Salem, Or
78 GMC ROYALE 403 w/a Manny tranny that shifts harshly when the throttle is
down. How I like it.
On May 19, 2017 6:26 AM, "Johnny Bridges via Gmclist" <
> Probably not, but invoke Standard Transmission Info Source #1: Call or
> email Manny.
>
> --johnny
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
balances against the force from the vacuum operated diaphram. The harder
you press down on the gas, the less vacuum you have available to move the
diaphram, and the spring becomes the dominant force. Shift point moves up,
and shift becomes a bit harsher. If you feel it is shifting too harsh, back
off the adjustment screw a bit. 1-2 up shift at light throttle occurs when
all is correct at 8 to 14 mph, give or take. 2-3 shift, 25 -35 or so. If
you mash the throttle, then it won't up shift until the governor forces the
shift.
Jim Hupy
Salem, Or
78 GMC ROYALE 403 w/a Manny tranny that shifts harshly when the throttle is
down. How I like it.
On May 19, 2017 6:26 AM, "Johnny Bridges via Gmclist" <
> Probably not, but invoke Standard Transmission Info Source #1: Call or
> email Manny.
>
> --johnny
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
I rebuilt my tränsmission. I have the 403 with the 4.10 final drive. After rebuild,I thought it was shifting fine at 6 mph and 23 mph, but with what
was said, I am wondering. I put in the modulator that came with the kit. Not the same as OE. No adjustment screw. Do I need the original equipment
modulator on there to adjust and make it shift a bit latér?
was said, I am wondering. I put in the modulator that came with the kit. Not the same as OE. No adjustment screw. Do I need the original equipment
modulator on there to adjust and make it shift a bit latér?
The screw is down the tube where the vac hose is connected.
These adjustments are standard.
Please look again.
On Tue, May 30, 2017 at 6:47 PM, Sigmund Frankenfelter <
> I rebuilt my tränsmission. I have the 403 with the 4.10 final drive.
> After rebuild,I thought it was shifting fine at 6 mph and 23 mph, but with
> what
> was said, I am wondering. I put in the modulator that came with the kit.
> Not the same as OE. No adjustment screw. Do I need the original equipment
> modulator on there to adjust and make it shift a bit latér?
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
These adjustments are standard.
Please look again.
On Tue, May 30, 2017 at 6:47 PM, Sigmund Frankenfelter <
> I rebuilt my tränsmission. I have the 403 with the 4.10 final drive.
> After rebuild,I thought it was shifting fine at 6 mph and 23 mph, but with
> what
> was said, I am wondering. I put in the modulator that came with the kit.
> Not the same as OE. No adjustment screw. Do I need the original equipment
> modulator on there to adjust and make it shift a bit latér?
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
Take a look at this....
http://www.gmcmhphotos.com/photos/transmission-install/p26806-img-0716.html
HTH
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
http://www.gmcmhphotos.com/photos/transmission-install/p26806-img-0716.html
HTH
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
