Non Lockup To Lockup

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RustyRatRod

RustyRatRod

I was born on a Monday. Not last Monday.
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Can I make a lock 904 out of a non lockup 904 if I have everything to do it from the lockup transmission?
 
If you could find the slant to LA 904/727 adapter, you could source the much more common V8 lockup 904.
 
Those light trucks might be a source, many of those has slants and 904's in the 80's
 
I was under the impression that the difference between lockup and non lockup is valve body, input shaft, converter. How are the cases different? Seems if you had the parts from a lockup v8 they’d swap in to a slant case. @transman ?
 
The lockup has a like 5/8" smooth button on the end of the input shaft, whereas the non lockup is splined all the way to the end.

I don't know WTF I'm thinkin. A lockup transmission ain't gonna get me anymore than 1:1 and I have that RIGHT NOW with a three speed. lol
 
RustyRatRod said:
The lockup has a like 5/8" smooth button on the end of the input shaft, whereas the non lockup is splined all the way to the end.

I don't know WTF I'm thinkin. A lockup transmission ain't gonna get me anymore than 1:1 and I have that RIGHT NOW with a three speed. lol
Click to expand...

42RH? Isn’t that the non electric over drive 904?
 
RustyRatRod said:
The lockup has a like 5/8" smooth button on the end of the input shaft, whereas the non lockup is splined all the way to the end.

I don't know WTF I'm thinkin. A lockup transmission ain't gonna get me anymore than 1:1 and I have that RIGHT NOW with a three speed. lol
Click to expand...
Dummy!
 
RustyRatRod said:
The lockup has a like 5/8" smooth button on the end of the input shaft, whereas the non lockup is splined all the way to the end.

I don't know WTF I'm thinkin. A lockup transmission ain't gonna get me anymore than 1:1 and I have that RIGHT NOW with a three speed. lol
Click to expand...
No you have a 1:1 ratio in the trans and some converter slip. The lock up will knock off 200-300 rpm by eliminating the slip. So the ratio won’t change but the rpm drop in lockup is a big plus.
 
TT5.9mag said:
No you have a 1:1 ratio in the trans and some converter slip. The lock up will knock off 200-300 rpm by eliminating the slip. So the ratio won’t change but the rpm drop in lockup is a big plus.
Click to expand...

I know, the converter slip means it's not 1:1. With lockup it is, so I will gain nothing over high gear in a three speed manual. Right?
 
Wow one word makes so much difference. “Manual”. I completely breezed right through that one. Well we know who the dummy is.
RustyRatRod said:
I know, the converter slip means it's not 1:1. With lockup it is, so I will gain nothing over high gear in a three speed manual. Right?
Click to expand...
 
In that case I’d build an adapter plate and stuff a t5 behind it.
 
@lkopaska built a lock up for his 67 convert. It has to help but for sure not as much as a overdrive.
 
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RustyRatRod said:
And I HAVE a world class T5. Don't tempt me.
Click to expand...
 
Geez rusty what you need is an A833 OD!!!!!

..........Which brings me to...........

I'm not terribly familiar with the development of 3 speed bells over the years. "Why can't" you modify the bell/ add a say 1/4 or 5/16 plate as a base to modify the 4 speed bolt pattern? I'm guessing you'd need to enlarge the center hole, which I did on a 340 bell AKA paid a guy with a big lathe!! (18 spline box into a 340)

THEN you could fiddle with the column linkage to shift the 4 forward gears LOL and put an extra lever to operate reverse!!!
 
RustyRatRod said:
I know, the converter slip means it's not 1:1. With lockup it is, so I will gain nothing over high gear in a three speed manual. Right?
Click to expand...
1,2,3 shift then lockup will drop the rpm another 200ish rpm. When you drive one it feels like an auto 4 speed.
 
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