AlfredHitchcock Posted February 15, 2014 Report Share Posted February 15, 2014 Ive fitted an A type overdrive for my TR4 and a right angled speedo drive. Looking at the picture it seems to stick out to much for the tranny cover (although I havent tried it on yet). Have I got something wrong here? Also is the drive angled correctly for the cable? Thanks Nick Quote Link to post Share on other sites
RogerH Posted February 15, 2014 Report Share Posted February 15, 2014 Hi Nick, the G/B for the O/D has a bulge to take in the angle drive. I think it needs to be angled lower. Roger Quote Link to post Share on other sites
Bob Smith Posted February 15, 2014 Report Share Posted February 15, 2014 Nick, If you have a TR4 then a right angled drive isn't really necessary - S-T did not use them until the 4A (all to do with the chassis construction). The cable goes under the floor in as large a radius as you can manage and up the outside of the front bulkhead. Quote Link to post Share on other sites
AlfredHitchcock Posted February 15, 2014 Author Report Share Posted February 15, 2014 Thanks Roger I have been out to the shed and had a look at my fibreglass cover and it does have a bulge there. In fact there isnt a horizontal lip to seal so I will have to look carefully at that. This reminds me......... I was considering cutting my tranny cover in half just in front of the H bracket to allow easy access to overdrive solenoid etc. I'm sure I've seen picture of this somewhere. Have any of you guys done this? Ive got the angled drive now so I might as well use it. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted February 15, 2014 Report Share Posted February 15, 2014 Fit the correct cable without an angle drive on a TR4. The rubber boot that goes round the hand brake lever has a moulding to accept the cable route. The cable routes down through the hole in the floor the hand brake pokes through, along the chassis rail then up to the dash via the engine compartment. See Moss cat for correct cable - something about 7 foot long for overdrive cars jumps to mind. Cheers Peter W Quote Link to post Share on other sites
AlfredHitchcock Posted February 16, 2014 Author Report Share Posted February 16, 2014 Of course thats what the funny shape moulding is for in the rubber handbrake gasket. I've wondered about that before. You learn something new every day Peter. Thanks for that. Quote Link to post Share on other sites
RogerH Posted February 16, 2014 Report Share Posted February 16, 2014 Hi Nick, you do not have to cut the tunnel in half (although some people do) to access the solenoid. A hole in the side with a cover plate should be adequate., Roger Quote Link to post Share on other sites
AlanT Posted February 16, 2014 Report Share Posted February 16, 2014 Scroll down on this and look for "split gearbox tunnel" http://www.racetorations.co.uk/page20.html Quote Link to post Share on other sites
Nigel 628 Posted February 16, 2014 Report Share Posted February 16, 2014 I cut the tunnel on my TR4 across just behind the 'H' bracket (gear lever side!) and pop riveted a strip of aluminium, bent to shape, so half it's width was underneath the main section of the tunnel. I drilled four holes through the smaller rear section and the exposed part of the ally strip, and set some threaded Rivnut inserts into the ally strip. It's similar to the commercial version in principal. Cost = 4 Rivnuts. Unscrew the four screws, and the two original rear screws in the floorpan, and the rear section lifts off giving access to everything including an overdrive if fitted, the front propshaft UJ, and in my case the sensor for the rally tripmeter which reads the prop flange bolts. Plus much better access to the gear lever assembly. As it's a rally car I have much less room between the FIA-approved composite front seats but it's still a very quick job to remove and replace. I no longer use an overdrive but have never had a right-angle drive on the speedo cable, it's connected direct to the box in as gentle a curve as possible. To date in six years of hard rallying I'm still on the same cable! I had heard that some remanufactured angle drives had reliability problems? I had intended to make a foam seal for the joint but despite my car encountering far more mud and water than the average TR there is no more than the occasional slight seep into the car. It has also allowed me to seal the main front part of the tunnel thoroughly to floor and bulkhead with silicone mastic so it just doesn't leak water (or cold winter draughts!) into the car any more. Even on a rally car I take the 'box out only rarely and it's not too bad a job to cut out the mastic if need be, I get all the access I need for regular maintenance via the rear section. Makes you wonder why Triumph didn't do it in the first place! Nigel Quote Link to post Share on other sites
AlfredHitchcock Posted February 16, 2014 Author Report Share Posted February 16, 2014 I'm going to copy your idea Nigel. Sounds simple enough. Thanks Quote Link to post Share on other sites
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