Quote:
Originally Posted by JSchmitz
B-man, what's goin' on? Too busy driving it to post?  |
Not a lot going on lately, my hours at work have been increased so I have less free time and energy
to get things done.
I did spend some time fitting up some universal Lokar column shift linkage made for GM auto transmissions, I want to keep the original 2-speed auto column shifter that came in the Tempest. The factory shift linkage that is supported by a pivot bracket on the frame and the trans selector shaft won't work, the selector shaft on the 4L70E is located about 1-1/4" further back on the trans compared the the TH400 and original ST300 2-speed. The Lokar kit cost me about $50 and was well-worth it.
Back when I first installed a TH400 in the car to replace the original Super-Turbine 300 2-speed I did a few mods to the steering column so the shift linkage would travel far enough to grab low gear on the 3-speed TH400.
I took the steering column apart and filed a slot in the outer column at the bottom and in one of the inner pieces near the top to allow the extra shift lever travel I needed. I also modified the shifter detent that bolts to the bottom of the column by fabricating and welding on an extension that gives the lower lever another step in the detent.
Welding the fabricated mild steel step to the cast factory shifter detent seemed to go okay. I just used a little 308 stainless rod with a TIG welder and they joined together just fine. The weld did spit and pop a little during the process but it's lasted for over 30K miles so far and shows no signs of cracking.
The Lokar kit comes with a nice billet aluminum lever that slips over a splined bushing that bolts onto the shift selctor shaft. The splines fit together very tightly and the lever gets locked in place with a clamp bolt, very high-quality fit and finish on these parts.
The lever is slotted so you can adjust the amount of selector shaft travel. I used the position that's located the farthest out to limit the length of lever travel, I only want to select Overdrive, 3rd and 2nd. I see no need to be able to grab low gear. The trans will kick down if I need low gear while accelerating and the trans will start off in low by itself if the selector is in 3rd or Overdrive.
The factory 2-speed shift indicator pointer will be in the correct position for
Park,
Reverse and
Neutral and will be in the
Drive position for running in Overdrive. For 3rd gear it will be directly between the
Drive and
Low positions on the shift indicator, to engage 2nd I will have to pull the lever back and utilize the added shift detent that was welded on.
The Lokar kit comes with a 21"-long piece of 5/16" stainless rod that you bend and cut to length for your particular application. It comes threaded 5/16-24 on one end for a heim joint, the other end gets cut off and a piece that screws into the other heim joint slips over the rod and gets secured with a pair of 1/4-28 set screws.
The 5/16" rod is
very hard to bend cold, you need to clamp it in a large bench vise (using aluminum soft jaws) and push or pull it using all of your weight to bend it. I have my 6" vise bolted to the corner of a 48" X 36" X 1/2" thick steel welding table and I was able to lift the corner of it off the ground while bending the rod, so it's definitely plenty stiff and won't give any while shifting gears.
Getting the rod bent in the correct configuration takes a lot of time, constantly checking and bending it and later on trimming it until it's not hitting the firewall, engine or trans in all of the different positions of travel. I must have bolted this thing on and taken it back off 20 or 30 times before it was right.
The kit instructions tell you to file a couple of flats after marking their locations. I had a friend mill the flats perfectly level in relation to one another and properly located center to center so the 2 set screws (with blue Loctite) would be best able to positively secure the heim joint.
A lot of effort for a column shifter that almost nobody else would want on a car like this.
That's all for now, thanks for looking.
Merry Christmas!