Won't go passed 4500-4800 Rpm

[fleebag]

While doing a WOT pl log i can not get passed 45-4800 Rpms

Very fresh trans build with billet internals and a 9.5 NL verter

all my numbers look ok but i stay in it and still wont go higher rpms

possible trans guy put different governer or vb?

 

[bison]

You're not making enough power.

 

[fleebag]

dang
guess i should have stayed with stock trans and 10" LU ? i used to take it to 55-5800 on the 10" and stock trans then i went to a 6765 and nonlock now less rpms? hmm

should i try to put it in 1st and see if i can get it past 5k? i keep thinking it is the trans, cause i have had a couple issues since the install. I was hoping something was off inside? 2nd gear is almost not working too if i have it in there by itself i can rev it to 3k or more while drivng. that is why i think something else may be screwy. Not to mention the valve body s rod thing was installed bakerds originally

thanks

 

[bison]

dang
guess i should have stayed with stock trans and 10" LU ? i used to take it to 55-5800 on the 10" and stock trans then i went to a 6765 and nonlock now less rpms? hmm

should i try to put it in 1st and see if i can get it past 5k? i keep thinking it is the trans, cause i have had a couple issues since the install. I was hoping something was off inside? 2nd gear is almost not working too if i have it in there by itself i can rev it to 3k or more while drivng. that is why i think something else may be screwy. Not to mention the valve body s rod thing was installed bakerds originally

thanks

The converter you are using was probably specd for a 600+whp application (which it should be at least that with a 6765) and youre probably making a lot less than that. Your old converter was junk if it let the engine get to 5800 in 3rd and the car trapped less than 125mph in the quarter. If you throw some power at it it will act differently.

 

[KL Mallender]

Also a possibility is that the one-way clutch in the stator is locked up, not freewheeling after stall speed causing internal fluid drag.
Good luck,

Kevin.

 

[fleebag]

thanks again and prolly right it is my lower powr. my ignorance assumed it would be the same
the old vertr was a PTC 10.5 LU bought from the old Bryan on the board. no issues just the stock tranny was making noises so i found anothe rboard memberto build me one and i opted for a converter from Dusty. then when i had the isuue(s) with the new tranny i was hoping it was it.
my 109 build
30 over wisecos
billet mains
208 roller, td 1.65 rockers
gn1 alum heads o-ringed
ta headers, 3.5 dp, rjc 4'" single
port matched intake
rjc 70m tbody and plenum
dual nzl alky julio
gn1 front mount
6765 billet w 63 ex
trans supposedly all billet, drum input, servos etc, deep pan
somethig weird tho he said about vbody or governer like he used something else??

TT speed density chip, aem wideband etc

btw, maybe i just send the trans to u for rebuild? still no 2nd gear

thanks againView attachment 112111r.zip

 

[vkasm1]

How much boost?

 

[Dusty Bradford]

What boost are you running?

I've never had a converter stall the motor that low unless the boost is turned way down. In 2nd gear it should easily pull past that even at 15psi.

 

[fleebag]

25ish lbs
and i dropped the pan yesterday and a spring/roll pin was laying in the pan.it went to a shaft next to the govenor
i assume this rod/shaft help build pressure somewhere in the v-body so i hope this was my problem.

 

[clusolynn]

That is the converter clutch shift valve....

The pin shouldn't have fallen out! That valve could cause 'erratic' shift problems, it is theoretically, 'between' the governor and servo during the 2 nd gear shift.

 

[SSedan64]

ATSG Manual calls it a Converter Clutch T.V. Bore Plug,
Part #348 here >> Valve Body

 

[Dusty Bradford]

Also a possibility is that the one-way clutch in the stator is locked up, not freewheeling after stall speed causing internal fluid drag.
Good luck,

Kevin.

All my converters are spragless unless someone specifically asks for one to be installed.

 

[KL Mallender]

Dusty, I was not inferring a defect of one of your products, only passing along information as to how a "locked up stator" can restrain an engines output.
I'm sure you know what I'm talking about, but many here may not understand how to diagnois a defective stator clutch.

Kevin.

 

[Dusty Bradford]

Dusty, I was not inferring a defect of one of your products, only passing along information as to how a "locked up stator" can restrain an engines output.
I'm sure you know what I'm talking about, but many here may not understand how to diagnois a defective stator clutch.

Kevin.

I didn't take it that way so no offense taken. Just pointing out this converter does not have a stator clutch so that isn't the issue.

A broken stator support tube will make it behave the same as a broken sprag/diode/stator clutch but when this happens the converter fully couples at idle so your brake stall will be substantually less as well.

It sounds as if the converter is tighter than he needs at this particular boost level or this piece he found in the pan is affecting the fluid pressure in the converter, making it tighter. I'm not trans expert so I have no idea what function the piece in question serves. Drastically rasing the fluid pressure inside the converter will make it tighter.