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I have finally found the time to set up the control gear for my 42RH transmission replacing 727. I used pressure switches for both overdrive and lockup with vacuum switch to drop out of lockup on relatively light throttle opening and throttle position switch based on a WOT switch to drop out of...

Good to know. I saw a Youtube video of a Jeep suggesting lockup was like a 5th gear. Perhaps it is if you have excess slip in the TC. What about overdrive engagement? How quickly / hard should it come in and should it stay at lower RPM when it switches out until the gas pedal is pushed again?

I think I am on the home straight with my upgrade from 727 to 42RH but could still use a little advice. Overdrive seems to be working fine but I'm not sure about lockup. All seems pretty smooth with no juddering. I have separate relays for overdrive and lockup operation through pressure and...

Update on my issue. I had done all my checks underneath the car with it in Park. When I moved the selector to the other end of its travel the problem became clear. The kickdown arm was fouling the gear selector. With the selector in Drive - or worse, second, and the throttle pushed hard...

Brilliant! Thank you.

Picture attached. The serial is PK53009261 Date code 0939. As it is a 42RH I guess it must be between about 1988 and 1993 but I can't make any sense of this with the 10000 day formula.

Thank you. So much easier now I know where to look. My trans starts PK 5300, so I think I need a newer document. I have had another look on the net but can only find the one you linked. Any suggestions?

Please can someone help me with any extra information on the origin of my 42RH? The top rib has the number 4461106 E - 4 Then a sort of N and P combined in a circle. On the right of this 2 Circles, one above the other. The top one has 90 in the inner circle, the bottom one 91. 09104 between...

The lever is about 2" from centre of shaft to where it joins to kickdown rod.

I managed to get the car in the workshop for a few minutes today. It looks as though the kickdown operating arm is very slightly longer than I need for this application. With the throttle closed the kickdown lever is about 1/8" back from fully forward and at WOT the lever could still travel...

Approaching retirement with way too many projects part done so I paid a garage to change out the transmission. The mechanics seem really switched on and made a very good job of the linkage. I think they compared kick down actuating arms from 727 and 42RH and chose the better option. I need to...

What am I looking for when I drop the pan? I replaced the pan with a deeper aluminium unit when the transmission was installed less than 100 miles ago. I replaced the filter and fitted the Sonnax valves that allow the TC to fill in Park. Remaining fluid in the trans when I got it was dark red...

Thank you for the speedy and helpful replies. It did smell a bit... Kickdown linkage is rod all the way. Is it possible that this wasn't adjusted right when the transmission was installed and has caused the issue or more likely that the transmission was tired as purchased? The car has been...

Most of the fluid was drained for shipping before i got it but it didn't look too bad. It has new fluid in it now. What is most likely to be worn out?

I have finally installed a 42RH in place of my 727 and all seems well when driven in traffic at moderate throttle. Driving at about 50MPH I tried kickdown. It seemed to shift down but the engine revved very high without the anticipated surge forward - so much so that I was worried about the...

Does it have to be a carb? I'm seriously looking at a Holley Sniper 2 EFI for my Poly 318. Very little feedback on them other than installation instructions since the release this Summer so I'm hoping they might have fixed most of the issues the original had.

I think what I'm getting confused about here is difference between engine RPM and torque converter output RPM and how efficiently the torque converter is working as that changes. For the figures in my example to stack up there must be quite a bit more difference between input / output RPM at...

Thank you for a constructive reply. I think your breakdown aboveshows where part of the problem lies. People seize on a part of what you have written and flame you for it without trying to understand the whole question. What i'm getting into here is quite a complex topic. If I start a new...

Thank you for that. Sorry if my lack of understanding is frustrating but I'm finding it hard to work this out. Please try to be patient. Amongst other things I'm trying to work out the speeds to switch in overdrive and lockup automatically. In the above example it looks as though switching...

I was obviously assuming that the amount of slippage would be similar at a fixed speed and power between 2400RPM without overdrive and 1850RPM with overdrive. It looks as though I must have got this very wrong.

Let's ignore the lockup. So 2400RPM. No overdrive. No lockup. Presumably some slippage. Engage overdrive. Still no lockup. 1850RPM. I assumed much the same slippage. About 0.77:1 This suggests that either the gear ratio isn't 0.69:1 or that the slippage at 2400 is very different to that...

The figures I gave are both direct and without lockup. I assumed - perhaps wrongly - that the slippage at 2400RPM would be similar to slippage at 1850 rpm. Both travelling at about 70MPH on light throttle.

You are absolutely right. Of course lockup doesn't affect the gear ratio. If we ignore lockup in my figures the revs drop from 2400 to 1850 due to the overdrive gear ratio alone. This is about 0.77:1. I thought the gear ratio of the 418RH was 0.69:1. This didn't make sense. I then...

I obviously haven't explained very well. What i'm questioning is whether the gear ratio of the overdrive disregarding lockup should be 0.69:1 or whether the stated figure includes lockup.

I get that but I thought the gear ratio in the overdrive was 0.69:1 and that doesn't seem to be the case. It would be good to have that confirmed and know it's not extra slippage in this transmission.

Just checking figures for 46RH overdrive. 2400 RPM steady level driving. Switch in overdrive - 1850 RPM. This comes out at about 0.77:1 but the overdrive ratio is given as 0.69:1. Switch in lockup and RPM drops to 1650. 2400 to 1650 is a ratio of 0.68:1. Does the stated ratio include the...

One from over the pond: Lotus. Lots of trouble, usually serious. And for Lucas, who made most of the electrical gear back in the day: Loose unsoldered connectors and splices.

I have done a bit more research on the vacuum switches PATC supplies Superior Products switch KO58 6 to 22 ins vacuum Superior Transmission Parts offer KO52, 1 to 6 inches of vacuum for GM and KO58 for Chrysler, so it looks as though 6 to 22 is the required range. By my calculations this...

I just found a switch on Ebay that could be what you need. Item 355035872117 1/4 1/8 Adjustable Vacuum Negative Air Pressure Switch Vacuum Pressure Switch | eBay

I have spent hours looking for other vacuum switches and not come up with anything cheaper or better. I found a couple of other places selling the switches for about the same cost. I think there are two different models that adjust over different ranges so it may be worth calling PATC to make...