Alright, so to save a few bucks on a transmission I'm deciding to go with my TH350 in my truck now rather than a 4l60e. It's an '86 C20 with a 350 and Th350 trans right now.
My question is, What all do I need to do it?
-LS1 Flywheel
-LS1 Style Torque Converter
-Spacer
-VSS Sensor (Question below pertains to this)
-Kick Down Cable
With the VSS Sensor, I've seen people say to use a 4l60e tail housing with a spacer, and other's say you don't need it?
I have a mechanical speedo, not electronic, So I don't know if I need that or not, as the gauges are mechanical and the trans is setup for mech gauges already. I think the 4l60e Tail housing is for cars with electronic gauges, as this was mainly on 4th gen F-Body forums in my research.
Just use the speedo drive cable that you have now. It runs from the drivers sideof teh trans to your mechanical speedo cluster in the dash. If you change rear end gear ratios, then you will change teh plastic drive gear at teh start of your trans speedo drive cable so that your speedo reads correctly.
You dont need a 4l60e anything as you arent going to use a 4l60e trans.
For the kickdown cable, I plan on using a drive by cable Throttle Body. There's a company that makes a plate that mounts on the throttle body for a 700r4 Trans Cable. would that SAFELY work on a TH350 trans for the kickdown?
Thanks!
The thm-350 uses a kickdown cable, the 700R4/4l60(no E) uses no kick down cable, it uses a Throttle Valve cable. the TV cable is used by the 700r4/4l60(no E) for line pressure and shifting.
Your thm-350 uses a kickdoown cable for downshifting and a vacuum modulator for line pressure/shiftfirmness.
Your 1986 truck if original to the truck should have a thm-350-C which iis a thm-350 3 speed but has a lockup torque converter. If so there will be a 4 pin connector with a single pin wired to control the lockup clutch.
But I just noticed that you have a C20, my 1984 C10 had the thm-350C, not sure about a 3/4 ton.
You p/ns for the flexlate/spacer and bolts is correct. As stated to use the
thm-350 TC you will need to elongate the flexplate bolt holes a bit.
12563532 flexplate to crank spacer $41.06
LS1 Flexplate Spacer 12563532
19260102 flexplate $79.68
FLYWHEEL ASM (W/RING GEAR) 19260102
19257940 bolts $5.28(need 6 bolts)
LS1 Flexplate Spacer Bolt 12563533 19257940
This allows a cable to be mountd on the LS1 cable driven throttle body.
http://www.summitracing.com/int/parts/lok-xtcb-40ls1
Something like this for the trans.
http://www.summitracing.com/int/parts/lok-kd-2350tp/overview/
Here is the throttle cable I suggested shown on an LS1 cable throttle t-body. You can see how the throttle cable is attached, then you can also see that on the t-body arm, that there is an unused "nipple" onto which you can slide the thm-350 kickdown cable. Since the outer sheath of this(and teh stock) kickdown cable is bolted to the trans case, this allows the inner cable and outer
sheath to move independantly. So all you have to do is catch the kickdown wire inside the trans with teh inner part of eth kickdown cable, then fasten teh outer sheath to teh trans case(just like stock) run the cable up to the t-body and slide the t-body end over the "nipple" on the t-body throttle arm. Easy peazy.
\he kickdown cable on the thm-350 simply allows for kickdowns using the accelerator. Even if it wasnt attached, you could still manually downshift using the shifter.
There might even be a chance of your stock truck downshift/kickdown cable reaching. I;d try that 1st.
So long as you get the cable throttle cable attached with that lok-xtcb-40ls1 part that holds the throttle cable near the t-body, then use that kickdown cable I listed, all will work just fine.
peace
Hog