pump shim

[mainer]

Mike any idea on tolerances for this shim. Obviously the thickness needs to be exact or it will alter the desired pressure. What about the i/d & o/d dimensions.

ALso any more reccomendations for other internal mods while i'm at it.

 

[clayt171]

Mainer -

.852.......o/d
.591.......i/d

 

[mainer]

lol, i'm capable of reading


tolerance as in accepted margin of error... like +/- .001

 

[WolfLMM]

I would keep it at +/- .001 or less on the thickness but the od or id I don't know...never been it the trans.

 

[clayt171]

lol, i'm capable of reading


tolerance as in accepted margin of error... like +/- .001

Got ya. My bad. Since the measurements are out to the thousands place usually figure +/- .001 to be on the safe side.

 

[mainer]

just an fyi i just ordered a pump shim and the tool to install it from suncoast

the shim was like $4 and the tool was $13 i think plus shipping so probably cheaper than you could make one

 

[TrentNell]

ok so my complete tranny plans are as follows.... any recomendations would be greatly appreciated


c1-c4 power packs , running just 6 clutches in the c2 (space the rest with stock steels)

transgo shift kit

converter back flow valve

pump shim to up line pressure from 245 to 275psi

and either a precision or suncoast converter. (purple isnt my color)

what kind of power are you wanting it to hold ?

sounds like you have a pretty good list , only problems i see not being addressed are no extra clutches in the c-3's , and not arddessing the c-1 aply plate being to thin to aply even pressure to the the c-1 clutches . but back to my original question , if your not going crazy with power than you would be fine . if you going to 500 or above i would address those issue's .


edit just seen this is an old thread ...

 

[mainer]

i'm going with alto power packs which addresses both the c1 issue and the c3 issue

also the transgo kit, pump shim, and converter lock up valve and a precision converter


its going to be identical to a suncoast stg 3

 

[TrentNell]

i'm going with alto power packs which addresses both the c1 issue and the c3 issue

also the transgo kit, pump shim, and converter lock up valve and a precision converter


its going to be identical to a suncoast stg 3

meening more clutches in c-3 , and a thicker c-1 apply plate ? the alto's are better clutches but by themselves without more quantity in the c-3 and fixing the c-1 apply plate they wont be to there full potential .

 

[JoshH]

meening more clutches in c-3 , and a thicker c-1 apply plate ? the alto's are better clutches but by themselves without more quantity in the c-3 and fixing the c-1 apply plate they wont be to there full potential .

Can't say for sure on the C3, but the Alto clutches do come with a thicker plate for the C1.

 

[mainer]

c1 has 14 single sided carbon clutches

c3 has an extra clutch and steel , its identical to what your suncoast stage 3 uses IDENTICAL

 

[JoshH]

Why does SunCoast send a C3 piston with their kits?

And I couldn't get all 14 clutches in my C1. I ended up having to leave 1 out to get the proper clearance.

 

[mainer]

Why does SunCoast send a C3 piston with their kits?

that would be stage 4 your talking about i believe, unless they have changed recently or i'm wrong

 

[JoshH]

that would be stage 4 your talking about i believe, unless they have changed recently

I don't know. I have only helped with 1 SC install, and I don't remember what all was there as I was mainly working on installing a set of twins when the other guys were working on the trans. I just seem to remember seeing where the III has a modded C3 to fit in extra clutches in there and the IV has that plus a modded C4 to fit extra clutches in there.

 

[TrentNell]

Can't say for sure on the C3, but the Alto clutches do come with a thicker plate for the C1.

good to know... wasnt shure if it was a suncoast part . i bet the power -pack for the c-3's come with a extra clutch and thinner steels also .

 

[TrentNell]

I don't know. I have only helped with 1 SC install, and I don't remember what all was there as I was mainly working on installing a set of twins when the other guys were working on the trans. I just seem to remember seeing where the III has a modded C3 to fit in extra clutches in there and the IV has that plus a modded C4 to fit extra clutches in there.

the shorter c-3 piston comes in the stage 4 kit , and alows another clutch i beleive .

 

[mainer]

the shorter c-3 piston comes in the stage 4 kit , and alows another clutch i beleive .

correct


here is mikes explanation copied and pasted from DP

Suncoast 3 contains 14 Alto C1 one sided clutches with thick apply plate. C2 contains 7 Alto frictions with kolene steels and .200 apply plate, C3 has 5 Alto frictions with kolene steels, and C4 has 6 Alto frictions and kolene steels. Transgo shift kit is included with both filters.

Suncoast 4 has 16 C1 one sided Alto's with custom machined apply and pressure plates. C2 contains 7 Alto frictions and kolene with a wave plate and apply plate. C3 has 6 Alto frictions with kolene steels and .250 apply plate with custom machined apply piston as does C4. A ring gear spacer is supplied to support extra C3 clutch. Transgo shift kit, converter flow valve, and some models get a special C1 dump valve. A pressure regulator spacer is also supplied and both filters.



i think the sc3 may now have a wave plate in the c2 now to slow the c2 coming on in the 3-4 shift where there is the typical "double bang" / tie up that some of the older trannies experienced from increased pressure/ trim valves

anyone feel free to correct me because i only know what i read and try and filter through filth and fact and only retain the later

 

[JoshH]

the shorter c-3 piston comes in the stage 4 kit , and alows another clutch i beleive .

I see. So a SC III has 1 extra clutch/steel in the C3, and the SC IV has 2 extra clutches/steels in the C3 and 1 extra clutch/steel in the C4?

 

[mainer]

correct

 

[JoshH]

Makes sense. I wonder why I couldn't fit all 14 Alto clutches in my C1. Does SunCoast do anything to make them fit?