03' Big Red Posted August 31, 2020 Share Posted August 31, 2020 I have a 98 Mack RD688SX last part of vin is 040210 with a Allison 4560 i need a speed sensor, it screws into the LEFT side of tail housing The Mack P/N is 64MT-355M It is specific to 98-2000 Mack RD w/Allison im hopeful that someone has a new or used one they can sell me as Mack says it’s obsolete Quote Link to comment https://www.bigmacktrucks.com/topic/63957-speed-sensor/ Share on other sites More sharing options...
fjh Posted August 31, 2020 Share Posted August 31, 2020 Go see you Allison transmission shop Quote Link to comment https://www.bigmacktrucks.com/topic/63957-speed-sensor/#findComment-459857 Share on other sites More sharing options...
03' Big Red Posted August 31, 2020 Author Share Posted August 31, 2020 They can’t help as it’s a Mack part installed by Mack when the truck was built Quote Link to comment https://www.bigmacktrucks.com/topic/63957-speed-sensor/#findComment-459866 Share on other sites More sharing options...
Mackpro Posted September 1, 2020 Share Posted September 1, 2020 I had my buddy look up the part number and yes it is unavailable and no other dealerships show to have any in stock . The part number did crossover to a new Mack/Volvo part number but the description was listed as “Wiring Schematic “ and had a price of $650. Quote Link to comment https://www.bigmacktrucks.com/topic/63957-speed-sensor/#findComment-459890 Share on other sites More sharing options...
fjh Posted September 1, 2020 Share Posted September 1, 2020 That figures!!!! The Volvo turd parts system at it’s finest! P.o.s Quote Link to comment https://www.bigmacktrucks.com/topic/63957-speed-sensor/#findComment-459931 Share on other sites More sharing options...
03' Big Red Posted September 2, 2020 Author Share Posted September 2, 2020 Problem solved, we had to replace the VECM for other reasons and that solved the speedometer issue as well as the intermittent failure of the right turn signal. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63957-speed-sensor/#findComment-459978 Share on other sites More sharing options...
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